PDF malware analysis — malicious · e6b5b6067c6faf69

MALICIOUS

PDF

6.4 KB Created: 2009-10-25 20:35:22 Authoring application: Scribus 1.3.5svn (via Scribus PDF Library 1.3.5svn)

MD5: eb9e96b58fb66b0de19a03413eb1d540 SHA-1: 561eb02cf1e154e683cfe24691f2ec5874f8ff91 SHA-256: e6b5b6067c6faf6977bd7be2cc26e8f366540bf81a2834058e16e63e985b9f8e

96 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell

The PDF contains embedded JavaScript, indicated by multiple heuristic firings including PDF_JAVASCRIPT and PDF_JS. The ML classifier strongly flags this PDF as malicious. The embedded JavaScript, named 'javascript_obj0013_001.js', is likely responsible for executing a malicious payload, although its specific actions are obfuscated. The presence of unescape() and String.fromCharCode functions suggests attempts to decode and execute further malicious code.

Machine Learning

Nyx PDF Classifier malicious score 1.0000

Heuristics 5

unescape() call high PDF_UNESCAPE

unescape() found — often used to decode shellcode in PDF JS exploits (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 1

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj0013_001.js` `ae69f7c89edc3de288abcc19cb864d0735b1c14f3eb80fd3e154eced3fa2d79b`	pdf-javascript-stream	PDF /JS object 13 at offset 0xC11	11257 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 3 eval/decoder/string-building token(s).

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