PDF malware analysis — malicious · 139aab0089229626

MALICIOUS

PDF

4.6 KB

MD5: ec489c83f9bc6b65ad40a965ea67f400 SHA-1: 94d0cc46386d4cb5df491ddf823a21b055b7c492 SHA-256: 139aab008922962665ae7500cd5b9371f3ae03eb60fba4255a986cf0a5938e81

148 Risk Score

Malware Insights

MITRE ATT&CK

T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF file contains embedded JavaScript that is heavily obfuscated. Heuristics indicate this JavaScript is designed to exploit a known PDF vulnerability (PDF_JS_EXPLOIT_CLUSTER, PDF_EVAL). The script's primary function appears to be downloading and executing a second-stage payload from a remote source, as suggested by the ML classifier and the nature of the obfuscated 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 (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.
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_obj0001_000.js` `9bef692831552820427df368074e8b56cde1ce69a6ab24b4f8cb87e5f994e6c3`	pdf-javascript-stream	PDF /JS object 1 at offset 0xF	67 bytes
`javascript_obj0013_001.js` `7ebe1740e1e26e8a54c8fd536b869298ba6d93c00282b60d47a6f7bedbd2728c`	pdf-javascript-stream	PDF /JS object 13 at offset 0x39D	8513 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s).

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