PDF malware analysis — malicious · 9b4d92bb2164dafa

MALICIOUS

PDF

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

MD5: 9e6409cd7f7ec02f77cb34ecee408a11 SHA-1: 2d559e6a4966bdb9a5b47eaa5d876b232482cd86 SHA-256: 9b4d92bb2164dafa1eb3e0a568a21c8220c42c5ee79f4da4bb2f16a213f77eb4

196 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.002 Malicious File

This PDF file was flagged as malicious by ClamAV with the signature Pdf.Exploit.Agent-35541. Static analysis revealed embedded JavaScript, including an eval() call and String.fromCharCode usage, indicating obfuscated code execution. The presence of a PDF launch action further suggests an attempt to exploit a vulnerability. The primary attack pattern involves leveraging these JavaScript capabilities to likely download and execute a secondary payload.

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` `b1798ac68504378eda2545fb63eadc334d45b12ffd204b46b8cc02b9b62386fd`	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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