PDF malware analysis — malicious · 55ab40cfeb369ba4

MALICIOUS

PDF

10.4 KB Created: 2009-02-19 14:45:49 -02:00 Authoring application: Writer (via OpenOffice.org 3.0)

MD5: ce631962160a1c5df544d1d726262fcb SHA-1: 5d2af9e57bd0e3af54a6f591b4c6b4d9ef331bc1 SHA-256: 55ab40cfeb369ba4846ff08d56b6430f06e47089add044504f69c10a4194a7ed

196 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.002 Malicious File

This PDF file was flagged by ClamAV as Pdf.Exploit.Agent-35541, indicating a known exploit. Static analysis revealed embedded JavaScript with eval() calls and String.fromCharCode usage, typical of obfuscated malicious code. The ML classifier also strongly indicated maliciousness. The primary attack vector appears to be the exploitation of a PDF vulnerability to run arbitrary JavaScript, which is likely used to download and execute a further stage of malware.

Machine Learning

Nyx PDF Classifier malicious score 0.9999

Heuristics 7

ClamAV: Pdf.Exploit.Agent-35541 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Exploit.Agent-35541
Launch action high PDF_LAUNCH

PDF contains a /Launch action with an unresolved or extension-less target — treat as potentially dangerous
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 1

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj0027_000.js` `5ab41b13079b266ecc4c6d39e80f353699ee8c8aa98998938e2ac808ec9a01d4`	pdf-javascript-stream	PDF /JS object 27 at offset 0x21C1	4473 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 3 eval/decoder/string-building token(s).

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