PDF malware analysis — malicious · 2aab769fe8c44942

MALICIOUS

PDF

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

MD5: fdd1e83152d9acbff9efbffb6b8ed746 SHA-1: 19f038716e17dab308d85925f2755b5bc8f72a2d SHA-256: 2aab769fe8c4494244f7e303dc56e0cffade02f1e1840e7c6444a02ed5e9d52f

156 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell

This PDF file was flagged by multiple heuristics, including a high-confidence ML classifier and ClamAV detection as 'Pdf.Dropper.Agent-7126048-0'. It contains embedded JavaScript, indicated by 'PDF_JAVASCRIPT' and 'PDF_JS' firings, and uses 'unescape()' and 'String.fromCharCode()' functions, suggesting obfuscation. The presence of 'javascript_obj0013_001.js' as a suspicious extracted artifact further supports the malicious nature. The primary attack pattern involves the execution of this embedded JavaScript, which is likely designed to download and execute a second-stage payload.

Machine Learning

Nyx PDF Classifier malicious score 1.0000

Heuristics 6

ClamAV: Pdf.Dropper.Agent-7126048-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Dropper.Agent-7126048-0
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` `202073d1eb84781c2b9b5710e5c735e7f4bfbe393f8e6b0d11924715ea3cfad2`	pdf-javascript-stream	PDF /JS object 13 at offset 0x1917	11035 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 3 eval/decoder/string-building token(s).

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