PDF malware analysis — malicious · fb0c8757d7170a6a

MALICIOUS

PDF

28.3 KB Created: 2010-03-13 11:18:43 Authoring application: Eni8VgN (via b2NuwH)

MD5: f2f4fbf9525ff051f4baa1c00aff11a1 SHA-1: 6f6479ad942f2b3e314aeacba902abbe004d43a5 SHA-256: fb0c8757d7170a6ab133266e323d16fd032d60bf6aca196cfe571b96e11d41da

96 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell

This PDF file contains embedded JavaScript, indicated by multiple heuristic firings including PDF_JAVASCRIPT, PDF_JS, and a high-confidence PDF_EVAL call. The ML classifier also flagged it as malicious. The embedded JavaScript, named javascript_obj0007_000.js, is likely responsible for downloading and executing a second-stage payload, which is a common technique for malware delivery. The obfuscation within the script and the use of eval() suggest an attempt to hide malicious activity.

Machine Learning

Nyx PDF Classifier malicious score 1.0000

Heuristics 5

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.
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_obj0007_000.js` `b3c24f435361f39277ff4621d59cc0164b612b5025d1edd6da3c0964878cb141`	pdf-javascript-stream	PDF /JS object 7 at offset 0x244	27751 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s).

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