PDF malware analysis — malicious · 64ae226b83d1fe24

MALICIOUS

PDF

9.5 KB Created: 2008-07-26 19:43:58 Authoring application: Scribus 1.3.3.12 (via Scribus PDF Library 1.3.3.12)

MD5: 3f94f4de27f7d2319cc3edd9aac6ab95 SHA-1: 9b9ed013e4f8a866278ca3d0105f3a6fa3afaf4b SHA-256: 64ae226b83d1fe24bed4df9a39dc996badfef4fbdc6ba2893eb962a92be07ace

148 Risk Score

Malware Insights

MITRE ATT&CK

T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF contains obfuscated JavaScript that utilizes eval() and String.fromCharCode to dynamically construct and execute code. This behavior is indicative of an exploit attempting to download and run a secondary payload. The ML classifier strongly flags this PDF as malicious, and the presence of JavaScript exploit cluster heuristics further supports this assessment.

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 1

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj0013_000.js` `853ab57d6da33e04cbb05fb3c97b83a85dfbdffe9c44b3b2f6bf51f064638f28`	pdf-javascript-stream	PDF /JS object 13 at offset 0x336	8216 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s).

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