PDF malware analysis — malicious · b34f4e7de0cecf3c

MALICIOUS

PDF

10.0 KB Created: 2009-10-04 13:45:55 Authoring application: Scribus 1.3.5svn (via Scribus PDF Library 1.3.5svn)

MD5: dc5517169b9f8461c8b6eb95f0ca074d SHA-1: cccf7bd8f0e0a93fb3bb2a57bb120c3b01618613 SHA-256: b34f4e7de0cecf3cf3e322f119e410cba3d10520fb24b9ff9c233a84288848ed

96 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell

The PDF file contains obfuscated JavaScript, indicated by multiple heuristic firings including PDF_JAVASCRIPT, PDF_JS, PDF_UNESCAPE, and PDF_FROMCHARCODE. The ML classifier also flagged this PDF as malicious with a high probability. The embedded JavaScript, named 'javascript_obj0013_001.js', is likely responsible for downloading and executing a second-stage payload. Due to the obfuscation and lack of specific indicators, the exact payload and delivery mechanism remain unknown, leading to an 'unknown family' classification.

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` `e9615652b747014b22514f405b10de9e0d437c5d4061c4a9c1de1b809ee54c64`	pdf-javascript-stream	PDF /JS object 13 at offset 0x1917	13285 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 3 eval/decoder/string-building token(s).

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