PDF malware analysis — malicious · 9bcae901e1577bd2

MALICIOUS

PDF

11.2 KB Authoring application: Scribus 1.4.5.1 (via Scribus PDF Library 1.5.3.1)

MD5: 27f416d9f4af5c831fcada98366b59d2 SHA-1: 4da3dfdbfa30665ba8ab19c0f5326e3588667a8f SHA-256: 9bcae901e1577bd2d773e1d7ef15cf452ec5c316d1ae2ab84479b16768c799eb

178 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1027 Obfuscated Files or Information T1140 Deobfuscate/Decode Files or Information

The PDF file contains heavily obfuscated JavaScript, indicated by multiple heuristic firings including PDF_JAVASCRIPT, PDF_JS, PDF_EVAL, PDF_UNESCAPE, and PDF_METADATA_EVAL_STAGER. The ML classifier also flagged it as highly malicious. The embedded JavaScript streams, javascript_obj0013_001.js and javascript_obj0013_002.js, are likely responsible for decoding and executing a second-stage payload, although their exact function is obscured. The presence of Scribus metadata suggests a potential vector for embedding malicious content.

Machine Learning

Nyx PDF Classifier malicious score 1.0000

Heuristics 7

eval() call high PDF_EVAL

eval() found — commonly used for obfuscated exploit execution
unescape() call high PDF_UNESCAPE

unescape() found — often used to decode shellcode in PDF JS exploits
PDF metadata JavaScript eval stager high PDF_METADATA_EVAL_STAGER

PDF JavaScript reads document metadata fields such as title, subject, or producer, decodes character data with parseInt/String.fromCharCode style helpers, and evals the recovered stage. This is a high-signal exploit-kit staging pattern.
JavaScript action low PDF_JAVASCRIPT

PDF contains a /JavaScript action. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
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.
String.fromCharCode low PDF_FROMCHARCODE

String.fromCharCode found — used to construct payload strings dynamically. Common in benign JavaScript libraries for codepoint manipulation, so this alone is informational; weaponised use is also caught by the dedicated fromCharCode-stage and exploit-shape rules.
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
`javascript_obj0013_001.js` `5b6911f29cbd22016c8828bc291efa8b0eb02b8783ccff19d58236859dfb33ba`	pdf-javascript-stream	PDF /JS object 13 at offset 0x38B	9958 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 6 eval/decoder/string-building token(s). Carved artifact contains 4 long base64-like blob(s).
`javascript_obj0013_002.js` `7d4cd5747dbf9ff525c4abb50ab3d70a2fb51eb701dac2cd331365adcb2d82b8`	pdf-javascript-stream	PDF /JS object 13 at offset 0x3AD	10492 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 6 eval/decoder/string-building token(s). Carved artifact contains 4 long base64-like blob(s).

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