PDF malware analysis — malicious · 36de20d790f39fde

MALICIOUS

PDF

33.8 KB Created: 2010-01-06 23:25:16 +03:00 Authoring application: tendChunk (via 0736e8d5f3581a125a2e9872c3dfbca2)

MD5: f0023d41946ad3c180afc18af0c084fb SHA-1: 8c9e305616ce62457f7280cd02e985e8ad072076 SHA-256: 36de20d790f39fde488436f9c305f53ddb1f9f0011196f39a73991624e5cb488

156 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell

The PDF file was flagged by multiple heuristics, including PDF_JAVASCRIPT, PDF_JS, and PDF_EVAL, indicating the presence of embedded and obfuscated JavaScript. The ML classifier and ClamAV also identified it as malicious. The extracted JavaScript files, 'javascript_obj0016_000.js' and 'javascript_obj0018_001.js', are the primary artifacts. The eval() call within the JavaScript suggests dynamic code execution, likely to download and execute a second-stage payload. The obfuscation and the nature of the heuristics point towards a downloader or dropper functionality.

Machine Learning

Nyx PDF Classifier malicious score 0.9974

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_obj0016_000.js` `c9451db005656eae1ecd2b622f349a3b0740e6f6340680121acd46f2720dc3bb`	pdf-javascript-stream	PDF /JS object 16 at offset 0x200E	36596 bytes
`javascript_obj0018_001.js` `173ab58ad8dac7b8225ab01d720ca7b4c3e12e9fb9cc38dbe236894d7e3e8246`	pdf-javascript-stream	PDF /JS object 18 at offset 0x7CE8	1203 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s).

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