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WebAssembly module
API
This view is built from:
Module analysis/api/v1/wasm/d303140fb3ab0e70211bd87c7eea1be4b8c68155de122121cc1f36c493b8b1e8Decompiled code/api/v1/wasm/d303140fb3ab0e70211bd87c7eea1be4b8c68155de122121cc1f36c493b8b1e8/code

d303140fb3ab0e70211bd87c7eea1be4b8c68155de122121cc1f36c493b8b1e8

Known library: dotLottie animation playerDense dataHashing or cipher loops
Download .wasmSearch scans with this module

The file is the module exactly as the page had it. WebAssembly does nothing on its own: it runs only when a script instantiates it. Labels describe what the module contains and are leads, not verdicts.

At a glance

What it is
Known library: dotLottie animation player.
Names it came with
Came with the npm package @lottiefiles/dotlottie-web 0.77.1 · From cdn.jsdelivr.net · File name: dotlottie-player. Its build and the addresses it came from say so; whoever builds a module chooses these, so they are hints.
How it was built
Written in Rust. wasm-bindgen connects it to the page's JavaScript.
What it can do
None of its imports reaches the network, runs code or changes the page. Judged from the names of its imports.
Where we saw it
On 1 public scan, 2026-10-28.
Findings
Dense data, Hashing or cipher loops. Leads, not verdicts: legitimate modules show these too.
Size
1.7 MiB
First seen
2026-10-28
Last seen
2026-10-28
Public scans
1
Functions
2346
Imports
28
Exports
168
Data segments
393

How it was built

Written in Rust. wasm-bindgen connects it to the page's JavaScript.

Language
RustThe Rust compiler (rustc) left its name in the module.
Compiler
clangA C and C++ compiler. TinyGo and Emscripten use it too.
Connects to JavaScript
wasm-bindgenRust's bridge to JavaScript. It writes glue code on both sides, so the module can call page functions such as fetch or the DOM, and the page can call the module.
Rewritten after compiling
walrusA library for rewriting compiled modules. wasm-bindgen runs it on every build, so it comes with wasm-bindgen and says nothing more about the module.

Read from text inside the module (its build metadata and paths the compiler left) and from its import and export names. Whoever builds a module can change or remove these, so treat them as hints. They say how a module was made, not what it does.

What it is made of

11 Rust crates from crates.io, with the versions it was built with:

Build tools and versions it names:

  • Rust
  • C_plus_plus_14
  • C11
  • rustc 1.95.0 (59807616e 2026-04-14)
  • Homebrew clang 21.1.8
  • walrus 0.23.3
  • wasm-bindgen 0.2.100

Read from text the build left in the module: source paths, build metadata and .NET metadata. Whoever builds a module can change or remove it, so treat it as a hint.

Hashing and cipher code

Algorithms recognised from their published constants, tables and rotation amounts: CRC-32. Legitimate modules use them all the time, for hashing, captchas and encryption, so this is a lead, not a verdict.

Decompiled code

2,342 of 2,346 functions decompiled to C-like pseudocode; 28 more are imported from the page.

  • 4 of 2,346 functions could not be decompiled.

Decompiled code is a reconstruction from the file, so names and types are often guesses. Query values in URLs are masked here; the downloaded file is unchanged.

FunctionSizeBlocksComplexityNotes
No functions match.

File layout

WebAssembly binary format version 1, core module, 13 sections (2 custom).

SectionOffsetSizeItems
type0x81007 bytes131
import0x3f71.0 KiB28
function0x7fe2.3 KiB2,346
table0x113013 bytes2
memory0x113d5 bytes1
global0x114211 bytes1
export0x114d5.0 KiB168
element0x25771.9 KiB1
datacount0x2d0c4 bytes
code0x2d101.6 MiB2,346
data0x19a29c120.5 KiB393
custom: producers0x1b847a158 bytes
custom: target_features0x1b8518126 bytes
Memory
27 pages (1.7 MiB), no upper limit
Table 0
969 entries, up to 969 entries, funcref
Table 1
128 entries, no upper limit, externref
Globals
1
Element segments
1
Declared data segments
393
Function names
none (names were stripped)
Target features
+mutable-globals +nontrapping-fptoint +bulk-memory +sign-ext +reference-types +multivalue +bulk-memory-opt

Data segments

Each bar is one segment of the module's data: as wide as its size, as tall as its entropy. Bars above the dashed line are encrypted or compressed. 393 segments, 117.3 KiB in all. The chart shows 65: the first 64 and every encrypted or compressed one.

328 segments not drawn (99.9 KiB)02468Segment 0: 14,951 bytes, 5.32 bits per byteSegment 1: 5 bytes, 1.37 bits per byteSegment 2: 5 bytes, 1.37 bits per byteSegment 3: 5 bytes, 1.37 bits per byteSegment 4: 5 bytes, 1.37 bits per byteSegment 5: 5 bytes, 1.37 bits per byteSegment 6: 5 bytes, 1.37 bits per byteSegment 7: 5 bytes, 1.37 bits per byteSegment 8: 5 bytes, 1.37 bits per byteSegment 9: 5 bytes, 1.37 bits per byteSegment 10: 5 bytes, 1.37 bits per byteSegment 11: 5 bytes, 1.37 bits per byteSegment 12: 5 bytes, 1.37 bits per byteSegment 13: 5 bytes, 1.37 bits per byteSegment 14: 5 bytes, 1.37 bits per byteSegment 15: 77 bytes, 3.77 bits per byteSegment 16: 5 bytes, 1.37 bits per byteSegment 17: 5 bytes, 1.37 bits per byteSegment 18: 5 bytes, 1.37 bits per byteSegment 19: 5 bytes, 1.37 bits per byteSegment 20: 5 bytes, 1.37 bits per byteSegment 21: 5 bytes, 1.37 bits per byteSegment 22: 5 bytes, 1.37 bits per byteSegment 23: 5 bytes, 1.37 bits per byteSegment 24: 5 bytes, 1.37 bits per byteSegment 25: 5 bytes, 1.37 bits per byteSegment 26: 5 bytes, 1.37 bits per byteSegment 27: 5 bytes, 1.37 bits per byteSegment 28: 5 bytes, 1.37 bits per byteSegment 29: 5 bytes, 1.37 bits per byteSegment 30: 5 bytes, 1.37 bits per byteSegment 31: 5 bytes, 1.37 bits per byteSegment 32: 5 bytes, 1.37 bits per byteSegment 33: 5 bytes, 1.37 bits per byteSegment 34: 5 bytes, 1.37 bits per byteSegment 35: 5 bytes, 1.37 bits per byteSegment 36: 5 bytes, 1.37 bits per byteSegment 37: 5 bytes, 1.37 bits per byteSegment 38: 5 bytes, 1.37 bits per byteSegment 39: 5 bytes, 1.37 bits per byteSegment 40: 5 bytes, 1.37 bits per byteSegment 41: 5 bytes, 1.37 bits per byteSegment 42: 5 bytes, 1.37 bits per byteSegment 43: 5 bytes, 1.37 bits per byteSegment 44: 5 bytes, 1.37 bits per byteSegment 45: 5 bytes, 1.37 bits per byteSegment 46: 5 bytes, 1.37 bits per byteSegment 47: 5 bytes, 1.37 bits per byteSegment 48: 5 bytes, 1.37 bits per byteSegment 49: 5 bytes, 1.37 bits per byteSegment 50: 5 bytes, 1.37 bits per byteSegment 51: 5 bytes, 1.37 bits per byteSegment 52: 5 bytes, 1.37 bits per byteSegment 53: 5 bytes, 1.37 bits per byteSegment 54: 5 bytes, 1.37 bits per byteSegment 55: 5 bytes, 1.37 bits per byteSegment 56: 5 bytes, 1.37 bits per byteSegment 57: 5 bytes, 1.37 bits per byteSegment 58: 5 bytes, 1.37 bits per byteSegment 59: 5 bytes, 1.37 bits per byteSegment 60: 5 bytes, 1.37 bits per byteSegment 61: 5 bytes, 1.37 bits per byteSegment 62: 5 bytes, 1.37 bits per byteSegment 63: 5 bytes, 1.37 bits per byteSegment 280: 2,519 bytes, 7.8 bits per byte
data segment encrypted or compressed 328 segments not drawn 7.5 bits per byteHeight: bits per byte. Width: share of all the data.
  • Segment 280: 2,519 bytes at 7.8 bits per byte

Imports (28)

Imports from wbg are wasm-bindgen glue. Each __wbg_… import calls one JavaScript function in the page, and its name says which (__wbg_fetch_… calls fetch). The __wbindgen_… imports are wasm-bindgen's own helpers for strings, errors and memory.

  • wbg.__wbg_new_405e22f390576ce2
  • wbg.__wbindgen_string_new
  • wbg.__wbg_set_bb8cecf6a62b9f46
  • wbg.__wbindgen_number_new
  • wbg.__wbindgen_memory
  • wbg.__wbg_buffer_609cc3eee51ed158
  • wbg.__wbg_newwithbyteoffsetandlength_d97e637ebe145a9a
  • wbg.__wbg_new_a12002a7f91c75be
  • wbg.__wbg_new_78feb108b6472713
  • wbg.__wbg_push_737cfc8c1432c2c6
  • wbg.__wbg_settype_39ed370d3edd403c
  • wbg.__wbg_newwithu8arraysequenceandoptions_068570c487f69127
  • wbg.__wbg_createObjectURL_6e98d2f9c7bd9764
  • wbg.__wbg_newwithsrc_20307ca7e8762a81
  • wbg.__wbg_revokeObjectURL_27267efebeb457c7
  • wbg.__wbg_setvolume_3895e06a030ca4f7
  • wbg.__wbg_setcurrentTime_64727eddd3966512
  • wbg.__wbg_play_f6ec5fc4e84b0d26
  • wbg.__wbg_pause_b74c96d69f769518
  • wbg.__wbg_ended_b873fb75d0c13ca7
  • wbg.__wbg_newwithlength_5a5efe313cfd59f1
  • wbg.__wbg_setindex_4e73afdcd9bb95cd
  • wbg.__wbindgen_string_get
  • wbg.__wbg_new_8a6f238a6ece86ea
  • wbg.__wbg_stack_0ed75d68575b0f3c
  • wbg.__wbg_error_7534b8e9a36f1ab4
  • wbg.__wbindgen_throw
  • wbg.__wbindgen_init_externref_table

Exports (168)

Text it passes to the page

Fixed text the module hands to the page's JavaScript when it calls an import, read from the module file. Imports that reach the network, run code or change the page come first; web addresses are shown as their host.

ImportText
wbg.__wbg_settype_39ed370d3edd403caudio/mpeg

In our sandbox

  • Produced 3 strings at run time, listed below.

Strings it produced at run time

Text that appeared while it ran and is not in the file: decoded, decrypted or built by its code. Web addresses are shown as their host.

  1. InfiniteLoop
  2. 0123456789abcdefassertion failed: self.is_char_boundary(new_len)
  3. >?>>?456789:;<=

Checks we ran

  • Threat-feed matches: none
  • Names of mining software or pools: none
  • CryptoNight mining structure: not found
  • Hashing or cipher loops: 1 function (common in codecs and captchas)
  • Known hashing or cipher algorithms: CRC-32
  • Encrypted or compressed data: 1 block, 2.5 KiB (2.1% of its data)
  • JavaScript stored inside: none
  • Other modules inside: none
  • Imports that read browser or page details: none
  • Function names: removed (usual in release builds)

Static checks of the file: nothing in it was run for these. A finding is a lead, not a verdict.

Shares code with

Other modules that contain some of the same functions. They are ranked by functions few modules have, so a language's own runtime does not link every module built with it. Shared code often means a shared library or the same developer. It is a lead, not a verdict.

  • 92822207…471b251.2 MiB · first seen 2026-10-02 · 691 functions in common (45% of this module's, 51% of that one's)
  • 7e681fec…ca8d151.6 MiB · first seen 2026-10-09 · 365 functions in common (24% of this module's, 24% of that one's)
  • ffbb49b4…7b418e1.4 MiB · first seen 2026-10-27 · 257 functions in common (17% of this module's, 23% of that one's)

Seen on 1 public scan

PageTitleSeenHow it got there
www.docusign.comDocusign | #1 in Electronic Signature and Intelligent Agreement Management2026-10-28Downloaded as a file