PDF malware analysis — malicious · 465636f962bfae0d

MALICIOUS

PDF

4.7 KB Created: 2008-09-24 19:47:56 Authoring application: Adobe (via Notepad)

MD5: ef49040cedb8c521507a0ecbe26d0bae SHA-1: a1c1702d81c3ae94179cb3d30315904f752ec8a7 SHA-256: 465636f962bfae0dab20255f43b41d5a0ebcc346fbfa8cc8d9774a1375358b95

88 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell

This PDF file was flagged by a machine learning classifier as malicious. Static analysis revealed embedded JavaScript, which was further indicated by the 'PDF_JAVASCRIPT' and 'PDF_JS' heuristics. The 'PDF_UNESCAPE' heuristic suggests the JavaScript is obfuscated, likely to conceal its true purpose. The extracted artifact 'javascript_obj0006_000.js' is also noted as suspicious due to script obfuscation indicators. The primary function of the JavaScript appears to be downloading and executing a second-stage payload, though the exact URL or execution method could not be fully reconstructed due to obfuscation.

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_obj0006_000.js` `9e2485821daf0f48baae27c7432bd7e692d2425913619ef10c2b8e908edc52f8`	pdf-javascript-stream	PDF /JS object 6 at offset 0xFEE	169 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s).

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