PDF malware analysis — malicious · a94389e7bd305786

MALICIOUS

PDF

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

MD5: a5012fd8df3d510f605adae5ab96b504 SHA-1: ff0b4bde08409c0ce8a344942656793b35929184 SHA-256: a94389e7bd305786d80310f9bd15a4e49c999c8ad9d0eb4bdf828fe18ab91b59

196 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.002 Malicious File

The PDF contains embedded JavaScript, indicated by PDF_JAVASCRIPT and PDF_JS heuristics. The presence of PDF_LAUNCH and PDF_EVAL, along with a critical ClamAV detection for Pdf.Exploit.Agent-35541, strongly suggests the JavaScript is malicious. The ML classifier output of 0.999945 further supports this. The script likely downloads and executes a secondary payload, as evidenced by the 'eval()' call and the 'String.fromCharCode' usage, which are common obfuscation techniques for malicious JavaScript within PDFs. The extracted artifact 'javascript_obj0027_000.js' also contains script obfuscation indicators.

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` `835afa52386eab5bd82723064cefb89622bb635846fe71bb4c8b3c7d8c1bb1ad`	pdf-javascript-stream	PDF /JS object 27 at offset 0x1D69	5950 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s).

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