PDF malware analysis — malicious · b58144a014b98571

MALICIOUS

PDF

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

MD5: e03a1014ca87aa198df4b9cca2ace774 SHA-1: 94f4d32b68687b7bde88891338171cfbfc642caa SHA-256: b58144a014b98571661339d8c12a6cbbd8a74d82587acd6a040a012d84474b58

196 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.002 Malicious File

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as 'Pdf.Exploit.Agent-35541'. Heuristics indicate the presence of JavaScript with eval() and String.fromCharCode() calls, suggesting obfuscated code execution. This embedded JavaScript is likely responsible for launching an exploit, as indicated by the 'PDF_LAUNCH' and 'PDF_EVAL' firings. The primary function of this script appears to be downloading and executing 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` `388c394ae50319ec6b5487fab3b35e2b4443bc68e1232c99dea23cf8488784c0`	pdf-javascript-stream	PDF /JS object 27 at offset 0x21C1	6727 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 3 eval/decoder/string-building token(s).

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