PDF malware analysis — malicious · 639dacaaff2dbba9

MALICIOUS

PDF

26.1 KB

MD5: a6b6d52336226285484a0bfa594681a5 SHA-1: 74f635c3b9eaa512db848a69b933bb7e88d063b2 SHA-256: 639dacaaff2dbba999f68f7cd4ad1a3773df830a7485db7d2d6a8d696970b6ca

146 Risk Score

Malware Insights

MITRE ATT&CK

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

The PDF contains embedded JavaScript that utilizes an eval() call, a common technique for obfuscating malicious code. This JavaScript is likely responsible for downloading and executing a secondary payload, as indicated by the PDF_JS_EXPLOIT_CLUSTER heuristic. The large size of the embedded JavaScript stream suggests complex functionality, potentially involving exploit code.

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` `4a23dc41b075514cb26497644a999f4cf93aa4b26dff5bc9b68d7153d323345a`	pdf-javascript-stream	PDF /JS object 32 at offset 0x2CA	2886127 bytes

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