PDF malware analysis — malicious · 0646b1527e67d8d1

MALICIOUS

PDF

3.4 KB Created: 2009-03-01 14:38:01 Authoring application: Scribus 1.3.3.12 (via Scribus PDF Library 1.3.3.12)

MD5: ca754b71818ef01a5fc29ae1fc782884 SHA-1: ef96767bc9b5b4720bd145d70a6cfd80beee1e07 SHA-256: 0646b1527e67d8d18a3447cdd70305cb5cd2757c52148fab6556aea7cbeb49c5

156 Risk Score

Malware Insights

MITRE ATT&CK

T1059.007 JavaScript T1203 Exploitation for Client Execution

This PDF file contains embedded JavaScript that is heavily obfuscated. The script utilizes `eval()` and `String.fromCharCode()` to decode and execute further code, indicating a malicious intent to exploit vulnerabilities. The ML classifier strongly flags this PDF as malicious, and the presence of exploit cluster heuristics further supports this assessment. The primary function of the script appears to be downloading and executing a second-stage payload.

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` `381331b04ea30778434cd0c6a29174b6134f2280b25e4dc46f32ea575394508f`	pdf-javascript-stream	PDF /JS object 13 at offset 0x3CE	7124 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` `2521d663136224f7a09f5d8789da2a18060148f8bd9fea463a98315598a7942c`	deobfuscated-js	PDF JavaScript deobfuscation pass	16213 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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