PDF malware analysis — malicious · 12703f637128ac43

MALICIOUS

PDF

23.0 KB Created: 2011-72-51 03:25:00

MD5: 456c9303e5f961dea338cf6be3da8bb0 SHA-1: 5bd15df331a4ae7db57e4925b7ba1acc7fa9f42d SHA-256: 12703f637128ac432cedb2d0884d985a0527effa42c2124a0f2b2a9e7b08733d

148 Risk Score

Malware Insights

MITRE ATT&CK

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

The PDF contains embedded JavaScript that utilizes eval() to execute obfuscated code. This script appears to reconstruct and execute a string, likely a command or URL, which is a common technique for downloading and executing further malicious content. The ML classifier strongly indicates maliciousness, and the JavaScript exploit cluster heuristic 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 (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.
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_obj0001_000.js` `b72a219897a92aa436465ca83b0024e43540f7a0b6b446b46452b17c0f3b8b8e`	pdf-javascript-stream	PDF /JS object 1 at offset 0x5886	725 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s).

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