PDF malware analysis — malicious · 169e039ca7c442d3

MALICIOUS

PDF

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

MD5: dae36272d31c6534696a0a93a9669ffa SHA-1: f9d8019de817b28b6d7407da91ce69bddb577738 SHA-256: 169e039ca7c442d3506c00f0dca2efd2342b302ed43cb1cb2ea88009609bd8e7

148 Risk Score

Malware Insights

MITRE ATT&CK

T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF file contains embedded JavaScript that utilizes the eval() function, a common technique for obfuscating malicious code. This script is highly likely to be responsible for downloading and executing a secondary payload, as indicated by the PDF_JS_EXPLOIT_CLUSTER heuristic. The specific payload and its ultimate destination could not be determined due to the obfuscation and truncation of the script.

Machine Learning

Nyx PDF Classifier malicious score 1.0000

Heuristics 5

PDF JavaScript exploit cluster critical PDF_JS_EXPLOIT_CLUSTER

PDF combines an executable JavaScript/action surface with exploit staging indicators such as eval/unescape/fromCharCode, XFA script content, or a related CVE pattern. Benign form JavaScript remains low-severity, but this correlated cluster is high-confidence malicious behavior.
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` `0cc739da1a0f61c574a2cb88195b8bf26a553777ed4187b7d395aa56eb475528`	pdf-javascript-stream	PDF /JS object 7 at offset 0x1EE	26426 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s).
`javascript_obj0007_001.js` `1728495d01fed97e36a91c77dcaa9f80c5c76fc025155a24a99338b8d6528d45`	pdf-javascript-stream	PDF /JS object 7 at offset 0x1EE	488 bytes

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