PDF malware analysis — malicious · 10c6320e20617d51

MALICIOUS

PDF

31.6 KB

MD5: 939060b2e514910740f8cdd24d8bf65b SHA-1: 526b2b2d8ec7e5059bd04d0a16be8a1cb8bd4931 SHA-256: 10c6320e20617d51f04f5ccdc451f53e71993398b784259e31450d195f99363c

146 Risk Score

Malware Insights

MITRE ATT&CK

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

The PDF file contains embedded JavaScript that utilizes an eval() call, indicating an attempt to execute arbitrary code. The ML classifier strongly flags this PDF as malicious. The JavaScript stream is highly obfuscated and truncated, but its presence and the eval() call strongly suggest it's designed to exploit a vulnerability and download a secondary payload.

Machine Learning

Nyx PDF Classifier malicious score 1.0000

Heuristics 4

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.

Extracted artifacts 1

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj0032_000.js` `dacfc3537785ca80bbca52564290073393848293d71279033703a64800d3fb8c`	pdf-javascript-stream	PDF /JS object 32 at offset 0x2CA	3081941 bytes

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