PDF malware analysis — malicious · 93f4e6416b8f0d35

MALICIOUS

PDF

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

MD5: a858d34c2929938242723e790c789e0f SHA-1: 7881bffd6d32053b1aeb1e95b0dc3a2cf33d4231 SHA-256: 93f4e6416b8f0d35b7e0c59c1df630882756514ee12a40a54e53b71928e0d1d4

156 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell

This PDF contains embedded JavaScript, flagged by multiple heuristics including PDF_JAVASCRIPT and PDF_JS. The JavaScript stream utilizes eval() and String.fromCharCode(), indicating obfuscation and dynamic code execution. The ML classifier and ClamAV detection strongly suggest malicious intent, specifically as a dropper. The primary function appears to be downloading and executing a second-stage payload, as indicated by the dropper classification.

Machine Learning

Nyx PDF Classifier malicious score 0.9999

Heuristics 6

ClamAV: Pdf.Dropper.Agent-7283732-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Dropper.Agent-7283732-0
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` `6b7cee0e2dc61ccdceb08ef408beed7755873d3717df75e94509c85a3a07ebc3`	pdf-javascript-stream	PDF /JS object 6 at offset 0xB5	30773 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s). Carved artifact contains 7 long base64-like blob(s).

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