PDF malware analysis — malicious · c1d35b5026dcfcb9

MALICIOUS

PDF

3.0 KB Created: 2008-08-03 07:51:49 -09:03 Authoring application: Adobe InDesign CS3 (5.0) (via Adobe PDF Library 8.1)

MD5: bfab44c60d0cc13e19bc631825c154ab SHA-1: b4f54fd27bf59535b05acb4fca08bef2cbb075a1 SHA-256: c1d35b5026dcfcb9598f8f121379dcc0c5b61ffa0539161944dd095275ed5a54

88 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 Command and Scripting Interpreter: PowerShell

The PDF file contains embedded JavaScript, indicated by multiple heuristic firings including PDF_JAVASCRIPT and PDF_JS. The ML classifier strongly suggests maliciousness. The JavaScript stream, identified as 'javascript_obj0013_001.js', is likely responsible for executing the malicious payload. The high confidence is due to the strong ML signal and multiple JavaScript-related heuristics.

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` `05d5d82dda4022a228c97e946d524699eeb16cdf55bd7e04685883c0bb760a91`	pdf-javascript-stream	PDF /JS object 13 at offset 0x35B	2625 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 4 eval/decoder/string-building token(s).

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