PDF malware analysis — malicious · e9439ef625a621c4

MALICIOUS

PDF

28.9 KB Created: 2011-04-04 09:14:58 Authoring application: Adobe InDesign CS2 (4.6.4) (via CV+*JStUI+$Zrin[B!Rg.UI+$ZfCV+*Jrom[B!RCharCUI+$ZodeCV+*J)

MD5: e67850dd4e6f7a03eb96d467366a3ba3 SHA-1: 1f902f5eec2024dff233e8ca018a7a9c0896660c SHA-256: e9439ef625a621c4c70e7cfa162e5589c5c04b6e8e448a7474865d3e0f1eb6d5

90 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell

The PDF contains embedded JavaScript, flagged by multiple heuristics including PDF_JAVASCRIPT and PDF_JS. The presence of an eval() call within the JavaScript stream (PDF_EVAL) strongly indicates code execution. The ML classifier also confirms the malicious nature of the PDF. The JavaScript is likely used to download and execute a second-stage payload, though the exact mechanism is obfuscated.

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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