PDF malware analysis — malicious · 8de5b9453c316862

MALICIOUS

PDF

7.1 KB Created: 2009-11-12 18:17:06 Authoring application: Scribus 1.3.5svn (via Scribus PDF Library 1.3.5svn)

MD5: 08880fc39090b35f0690dc3febec7f22 SHA-1: f0a36fceae127dfdb7ada7fe2bb4c2516aca5ef8 SHA-256: 8de5b9453c31686207023e279832fbebdf50baba4926f3b2da46163e970f4d63

174 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.002 Malicious File

The PDF file contains embedded JavaScript, indicated by multiple heuristic firings including PDF_JAVASCRIPT and PDF_JS. The ML classifier and ClamAV detection strongly suggest malicious intent, specifically identifying it as 'Pdf.Exploit.Agent-6032'. The presence of obfuscated JavaScript, as noted by the 'Suspicious extracted artifact' heuristic, points towards an attempt to conceal malicious actions, likely the execution of a secondary payload. The extracted artifact 'javascript_obj0013_001.js' is a key indicator of this malicious behavior.

Machine Learning

Nyx PDF Classifier malicious score 1.0000

Heuristics 6

ClamAV: Pdf.Exploit.Agent-6032 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Exploit.Agent-6032
unescape() call high PDF_UNESCAPE

unescape() found — often used to decode shellcode in PDF JS exploits (matched inside decoded stream)
Suspicious extracted artifact medium 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.
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)

Extracted artifacts 1

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj0013_001.js` `53caf9361feb94821803aa0278adab8597ed611138e5ce1c5d0030454f5a1460`	pdf-javascript-stream	PDF /JS object 13 at offset 0xF03	13419 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 3 eval/decoder/string-building token(s). Carved artifact contains 3 long hex-escaped blob(s).

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