PDF malware analysis — malicious · 699f5ebb8b294208

MALICIOUS

PDF

3.5 KB Created: 2009-03-30 18:03:04 Authoring application: Scribus 1.3.3.12 (via Scribus PDF Library 1.3.3.12)

MD5: e01b6d89f16bd33a08f90811b7c717af SHA-1: 75f20d00e793d477ef9b47128e4cae9f3f16d1c5 SHA-256: 699f5ebb8b29420819054249d7be566e1570ae5ddf752face574c5f066932c52

156 Risk Score

Malware Insights

MITRE ATT&CK

T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF file contains embedded JavaScript that is heavily obfuscated and utilizes eval() and String.fromCharCode() for deobfuscation. This script is designed to download and execute a secondary payload, as indicated by the 'PDF JavaScript exploit cluster' heuristic and the presence of deobfuscated JavaScript artifacts. The ML classifier strongly flags this PDF as malicious.

Machine Learning

Nyx PDF Classifier malicious score 1.0000

Heuristics 6

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.
String.fromCharCode low PDF_FROMCHARCODE

String.fromCharCode found — used to construct payload strings dynamically. Common in benign JavaScript libraries for codepoint manipulation, so this alone is informational; weaponised use is also caught by the dedicated fromCharCode-stage and exploit-shape rules. (matched inside decoded stream)
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` `2b3e24f49a096d9488dbf70d19ae94f011fc9a9e1a98c7ea7c5f76ff6c16942b`	pdf-javascript-stream	PDF /JS object 13 at offset 0x3CE	7151 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s). Carved artifact contains 1 long base64-like blob(s).
`deobfuscated.js` `240e438ab95785739db4d1a9c67d53d908fa2aa19d4442abb9296e0dae3eb094`	deobfuscated-js	PDF JavaScript deobfuscation pass	15799 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 5 eval/decoder/string-building token(s). Carved artifact contains 2 long base64-like blob(s).

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