PDF malware analysis — malicious · 20c6c5819d0fc3cc

MALICIOUS

PDF

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

MD5: 42f5dd4dcb0f88c7b0fcd4b5ac65bbdb SHA-1: c8f2cd8a7615161984b2fb4cfb411b9a098c28ac SHA-256: 20c6c5819d0fc3cc4b84a6eaa3777e1779731086ce4915fdda250967775e8714

166 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.002 Malicious File

The PDF file contains embedded JavaScript with eval() calls and String.fromCharCode, indicating an attempt to obfuscate malicious code. Heuristics indicate a PDF launch action and JavaScript execution, strongly suggesting an exploit attempt. ClamAV detection as 'Pdf.Exploit.Agent-35541' further confirms its malicious nature. The primary attack vector appears to be leveraging JavaScript to trigger an exploit, likely leading to the download or execution of a secondary payload.

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` `528e71bec884753a8accfe464b23e9b7533c7d2f260019d1becf884945b2e35a`	pdf-javascript-stream	PDF /JS object 27 at offset 0x21C1	14675 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 3 eval/decoder/string-building token(s).

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