PDF malware analysis — malicious · 70510843953a27f3

MALICIOUS

PDF

26.1 KB

MD5: a97192ba9975b47eb8b5e488dd3bc0f7 SHA-1: 04b7676942bd810f9787595309465388610c5ce8 SHA-256: 70510843953a27f31579c5817391eab7d7145f4b085d48588ac2b7f62ce6ee6c

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 with eval() calls, a common technique for obfuscating malicious code. This JavaScript is highly likely to be responsible for exploiting a client-side vulnerability to execute arbitrary code. The ML classifier strongly indicates maliciousness, and the critical heuristic for a JavaScript exploit cluster further supports this. The exact payload or C2 infrastructure is not discernible from the provided evidence, hence the family is unknown.

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` `4558d68a48d548c6ae6f229a64cdb67e01516cb17933b3d74bc5fdb4f39de2ab`	pdf-javascript-stream	PDF /JS object 32 at offset 0x2CA	3175159 bytes

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