PDF malware analysis — malicious · d63a0331c2278be8

MALICIOUS

PDF

1.95 MB Created: 2009-12-24 19:26:33 +03:00 Authoring application: repeatTendLatin (via abcd43eee9c9f6bce781261953bad742)

MD5: 11dc199cf2ba13a0093016d4f011d0ff SHA-1: b7606ead14f4608701034cd5cb8f254a2b63c041 SHA-256: d63a0331c2278be81df522f4b96835148c36237051e41fda0093d0aefe2e5e8a

156 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 JavaScript/JScript T1204.002 Malicious File

The PDF contains embedded JavaScript, indicated by multiple heuristic firings including PDF_JAVASCRIPT, PDF_JS, and PDF_EVAL. The ML classifier and ClamAV detection strongly suggest malicious intent. The embedded JavaScript streams, named javascript_obj0012_000.js and javascript_obj0014_001.js, are the primary mechanism for executing the malicious payload. The exact function of the script is obfuscated, but its presence and the high confidence scores point to a malicious downloader or exploit.

Machine Learning

Nyx PDF Classifier malicious score 0.9999

Heuristics 6

ClamAV: Heuristics.PDF.ObfuscatedNameObject critical CLAMAV_DETECTION

ClamAV detected this file as malware: Heuristics.PDF.ObfuscatedNameObject
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.
Optional Content Group with action trigger low PDF_OPTIONAL_CONTENT

Optional Content Group (layer) co-occurs with an action trigger — content can be selectively hidden from viewers or scanners while the action still fires on open
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 2

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj0012_000.js` `83e5a4696a17857e719ef617519957a87b31a3de1f5b222b18710a674aaa9e17`	pdf-javascript-stream	PDF /JS object 12 at offset 0x199C	36665 bytes
`javascript_obj0014_001.js` `99f76c66966f7c54dabf075f8b4f322fb6f40d2d6181d5c87a24aeae87a57cb4`	pdf-javascript-stream	PDF /JS object 14 at offset 0x75AC	1594 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s).

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