PDF malware analysis — malicious · b9577d1f56b6224f

MALICIOUS

PDF

28.9 KB Created: 2011-04-04 09:14:58 Authoring application: CV+*JStUI+$Zrin[B!Rg.UI+$ZfCV+*Jrom[B!RCharCUI+$ZodeCV+*J

MD5: baf2f6e6ee8310c85573cfd07f139a48 SHA-1: 8ecac07cbf76c62783833763c074c3024fc671c0 SHA-256: b9577d1f56b6224f3fa571a159200c4848f73f0ebe042b38e1acaa88fd282e1a

88 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell

The PDF contains embedded JavaScript that utilizes eval() calls, indicating obfuscated code execution. The ML classifier strongly flagged this PDF as malicious. The primary attack pattern involves leveraging JavaScript to download and execute further malicious content. No specific family could be identified, but the techniques suggest a downloader or dropper.

Machine Learning

Nyx PDF Classifier malicious score 1.0000

Heuristics 4

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.
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_obj0001_000.js` `0ed6056ef2310619cbb1af91e01767e3a3f98d30e91caf82b3a0b12c99e02655`	pdf-javascript-stream	PDF /JS object 1 at offset 0x23	1263 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 6 eval/decoder/string-building token(s).

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