PDF malware analysis — malicious · bc8ef5977bbec67c

MALICIOUS

PDF

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

MD5: ec4858fcaaebd68fd001ee5c9bf45735 SHA-1: 41f366cd0cf6dd8dfa1631d8664098fed3cc67b8 SHA-256: bc8ef5977bbec67c501ad83e593bb1b095481ee7af6ad4e6c62562b5854427db

196 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.002 Malicious File

The PDF file was flagged by ClamAV as Pdf.Exploit.Agent-35541 and contained embedded JavaScript. Heuristics indicate the use of eval() and String.fromCharCode, suggesting obfuscated code designed to execute actions. The ML classifier also strongly indicated maliciousness. The embedded JavaScript stream, named javascript_obj0027_000.js, is the primary artifact, likely responsible for 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` `af14d221abe430507a42eb2044faa35742e61967dbb9fba7f35f425a9d81d745`	pdf-javascript-stream	PDF /JS object 27 at offset 0x21C1	9785 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s).

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