PDF malware analysis — malicious · 10d85f5391e44716

MALICIOUS

PDF

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

MD5: aa70ee14183e2773e2cf46d284c2edba SHA-1: 12f2b63c2a81f1067d3487f314b4c7cc924c8c4b SHA-256: 10d85f5391e4471689b564271e19b4b534a838b5e2c3e7d6f1e5b063f595928d

148 Risk Score

Malware Insights

MITRE ATT&CK

T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF file contains heavily obfuscated JavaScript streams that utilize eval() calls, indicating an attempt to execute arbitrary code. The ML classifier strongly flags this PDF as malicious. The JavaScript's obfuscation and use of eval() suggest it is designed to download and execute a second-stage payload, a common technique for malware delivery.

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 2

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj0013_000.js` `79978344eccf764fb224e6ea1934fee959049a30b06eb023716ede62fa377530`	pdf-javascript-stream	PDF /JS object 13 at offset 0x336	9411 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s). Carved artifact contains 6 long base64-like blob(s).
`javascript_obj0013_001.js` `fc2a346dacbb1c1e702e77ab8f6e88e6d5e91fe3970c7e97bb9d3a5a1a052db3`	pdf-javascript-stream	PDF /JS object 13 at offset 0x358	10117 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s). Carved artifact contains 6 long base64-like blob(s).

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