PDF malware analysis — malicious · 6a4fbf6e36e2bb7d

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: cb21dcf0cbf2d775d9b0c8ee3f848f49 SHA-1: f3a53bba19d95293812abdda082724b285dae2bf SHA-256: 6a4fbf6e36e2bb7d1132056a9819af89be824307f85177ef5f670dc93bbbaa7f

148 Risk Score

Malware Insights

MITRE ATT&CK

T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF file contains obfuscated JavaScript, indicated by multiple heuristic firings including 'PDF_JAVASCRIPT', 'PDF_JS', and 'PDF_EVAL'. The JavaScript is designed to execute code, as evidenced by the use of eval() and string concatenation to build commands. The primary function of the script appears to be downloading and executing a second-stage payload, as suggested by the ML classifier and the presence of a long encoded blob within the extracted JavaScript.

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` `2f649c314e46440efd7f03884b84b81d8c3f114ee28724ca7db695b4d2c90dad`	pdf-javascript-stream	PDF /JS object 13 at offset 0x336	9375 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s). Carved artifact contains 8 long base64-like blob(s).

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