PDF malware analysis — malicious · b9ab4288ccb82418

MALICIOUS

PDF

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

MD5: bd8ef15388213da62e6ad874079843c1 SHA-1: 99d16f2fce31ab769410910f53a0b820912c1bd1 SHA-256: b9ab4288ccb82418e0c6d19cade7675b463369a9d33bfac2f90849a4604351c0

196 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.002 Malicious File

The file is a PDF document flagged as malicious by ClamAV (Pdf.Exploit.Agent-35541) and a machine learning classifier. Heuristics indicate the presence of embedded JavaScript with eval() calls and String.fromCharCode usage, suggesting obfuscated code execution. A launch action is also present, indicating an attempt to execute external content. The embedded JavaScript stream is likely responsible for downloading and executing a secondary payload, although the exact nature of the payload cannot be determined from the available evidence.

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` `a07ca169f06c301f16282f4db24f934b4d49786f42a6ed3f1a40a1ae52b3258c`	pdf-javascript-stream	PDF /JS object 27 at offset 0x21C1	23176 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s).

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