PDF malware analysis — malicious · 9bbd5bdf5dc181c1

MALICIOUS

PDF

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

MD5: d54ef37f0741c44b7e59a27298e23c61 SHA-1: a8fd2f04f4ac43924b582557d2d51a25fc0d4824 SHA-256: 9bbd5bdf5dc181c16257b409534fbb3c2412feeb2b69676e6e294cc8a871e19e

88 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell

The PDF contains obfuscated JavaScript, indicated by the PDF_JAVASCRIPT and PDF_JS heuristics. The presence of a high-confidence PDF_EVAL heuristic firing suggests the use of eval() to execute arbitrary code. The ML classifier also strongly indicates maliciousness. The embedded JavaScript is likely responsible for downloading and executing a second-stage payload, though its exact function is obscured by obfuscation.

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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