PDF malware analysis — malicious · 0a9c8ead395343ce

MALICIOUS

PDF

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

MD5: 44ec8181a13fc7510efa7fa7296f2553 SHA-1: 98a7e37b916187a8f5997bad344c5f8441723799 SHA-256: 0a9c8ead395343ce613fde1c0b51e4d211eade166824948a1944b3d2e2604db3

148 Risk Score

Malware Insights

MITRE ATT&CK

T1059.007 JavaScript T1203 Exploitation for Client Execution T1566.001 Spearphishing Attachment

This PDF file contains embedded JavaScript that utilizes eval() and appears to be obfuscated. The critical PDF JavaScript exploit cluster heuristic firing, along with ML classification, strongly indicates malicious intent. The JavaScript likely attempts to download and execute a secondary payload, a common technique for malware delivery.

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` `0b1590db5314a75475a1fb866a919eda5346790de71e48eafe8a37aac9d497b9`	pdf-javascript-stream	PDF /JS object 7 at offset 0x1EE	25272 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s).
`javascript_obj0007_001.js` `016528848b36ea9d775731c148d848399a532f8243c54d3c1d1db50f59998fda`	pdf-javascript-stream	PDF /JS object 7 at offset 0x1EE	25021 bytes

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