PDF malware analysis — malicious · a35c0af25778dd06

MALICIOUS

PDF

4.4 KB Created: 2008-12-17 23:30:58 UTC

MD5: 9df555e70deef57e9077be2d13a7ac9e SHA-1: cdb51794dd0d16a8950e022e249953e28fa6a22b SHA-256: a35c0af25778dd0685481866972d8dc48add780290c1ad9639eee8223f98b4f7

156 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell

The PDF contains embedded JavaScript with eval() and String.fromCharCode calls, indicating obfuscated code execution. ML classifiers and ClamAV strongly flag this as malicious, specifically as a dropper. The embedded JavaScript is likely responsible for downloading and executing a second-stage payload, as suggested by the 'Pdf.Dropper' detection name.

Machine Learning

Nyx PDF Classifier malicious score 0.9999

Heuristics 6

ClamAV: Pdf.Dropper.Agent-7289075-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Dropper.Agent-7289075-0
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_obj0006_000.js` `8862d008804c4e983c861d7939941fc4aa3577133a2fafbba3df181bb4bec9ca`	pdf-javascript-stream	PDF /JS object 6 at offset 0xB5	30730 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s). Carved artifact contains 8 long base64-like blob(s).

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