PDF malware analysis — malicious · 515c931b81816685

MALICIOUS

PDF

25.8 KB Created: 2006-02-01 14:14:12 Authoring application: Wegoptyr (via HghTc6Fs)

MD5: bc257ee56138e6920d4443f8568a8c9a SHA-1: 850258b0efddfb348823b23e4e1ad831fd422c3c SHA-256: 515c931b81816685d9a4a5ce107a1e7ff9d69e015b74392a7269c0c67b5995a1

88 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 Command and Scripting Interpreter: PowerShell

The PDF contains obfuscated JavaScript streams, indicated by multiple PDF_JAVASCRIPT and PDF_JS heuristic firings. The ML classifier strongly flagged this PDF as malicious. The presence of eval() calls suggests dynamic code execution. The embedded JavaScript files are the primary indicators of malicious activity, likely downloading and executing a second-stage payload.

Machine Learning

Nyx PDF Classifier malicious score 1.0000

Heuristics 4

eval() call high PDF_EVAL

eval() found — commonly used for obfuscated exploit execution
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 2

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj0007_000.js` `120a437c035b13deb794f3edd06f796c7bc41c8d1d15f2cf972bb9cf41632f17`	pdf-javascript-stream	PDF /JS object 7 at offset 0x1EE	25333 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s).
`javascript_obj0007_001.js` `8c291173e995efaaeccde3d6018d9a410537c1f08dfd9ee90ab9a6c8b42878b6`	pdf-javascript-stream	PDF /JS object 7 at offset 0x1EE	25058 bytes

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