PDF malware analysis — malicious · f4f1d2c4dc76e249

MALICIOUS

PDF

3.2 KB Created: 2008-11-06 14:00:46 Authoring application: Scribus 1.3.3.12 (via Scribus PDF Library 1.3.3.12)

MD5: 207b43918689d06654af4865adfc099d SHA-1: acc21d06b6290662773b3bb8a76c824c14ce466f SHA-256: f4f1d2c4dc76e249542f5a73d3c83d50c5fc350c12c257669eb2b18dd38b5032

98 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.002 Malicious File

The PDF contains embedded JavaScript, flagged by multiple heuristics including PDF_JAVASCRIPT and PDF_JS. The presence of an eval() call and String.fromCharCode() within the decoded JavaScript stream indicates obfuscation and dynamic code execution. The ML classifier strongly flags this PDF as malicious. The deobfuscated JavaScript likely downloads and executes a second-stage payload, a common technique for initial access.

Machine Learning

Nyx PDF Classifier malicious score 1.0000

Heuristics 5

eval() call high PDF_EVAL

eval() found — commonly used for obfuscated exploit execution (matched inside decoded stream)
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. (matched inside decoded stream)
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_000.js` `947bd9221e3d72b5a1ff283a7a5c2945dff666e613d4d36478453ee1a1538cb1`	pdf-javascript-stream	PDF /JS object 13 at offset 0x3CE	5444 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s). Carved artifact contains 1 long base64-like blob(s).
`deobfuscated.js` `d3b2f4474c7519db6e175461f50500c101a073e3ccd10aa96daa0ebebcc71199`	deobfuscated-js	PDF JavaScript deobfuscation pass	11350 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 5 eval/decoder/string-building token(s). Carved artifact contains 2 long base64-like blob(s).

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