PDF malware analysis — malicious · 3777e556ddbafa08

MALICIOUS

PDF

2.8 KB Created: 2008-07-02 07:51:49 -07:00 Authoring application: Adobe InDesign CS3 (5.0.2) (via Adobe PDF Library 8.0)

MD5: 16249da0fc1f66d3c34ae568ae92150d SHA-1: 1fc5ceb0c11f4579f6bccf32f14597fd175823ea SHA-256: 3777e556ddbafa08d7dcb35876bc47ee1226a8ad7d014d94ec5c6f6fc191a34d

88 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell

The PDF contains embedded JavaScript, indicated by the PDF_JAVASCRIPT and PDF_JS heuristics. The ML classifier strongly flags this PDF as malicious. The embedded JavaScript file, 'javascript_obj0013_001.js', likely contains obfuscated code designed to download and execute a second-stage payload. The presence of unescape() further suggests code obfuscation and execution.

Machine Learning

Nyx PDF Classifier malicious score 1.0000

Heuristics 4

unescape() call high PDF_UNESCAPE

unescape() found — often used to decode shellcode in PDF JS exploits (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_obj0013_001.js` `21c2ffd816b9b8ccc4968128383e54163df8c597124db03353f32d2268cf8283`	pdf-javascript-stream	PDF /JS object 13 at offset 0x377	2246 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 4 eval/decoder/string-building token(s). Carved artifact contains 1 long base64-like blob(s).

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