PDF malware analysis — malicious · 11a1c8c865aecd19

MALICIOUS

PDF

1.84 MB

MD5: b5a9ba293d7b3266afa29328ea864af8 SHA-1: e4e7b8d0ad0fa3639b23d15f305777f1baf0a13f SHA-256: 11a1c8c865aecd19227e9be7d159a6d4ae90e7c39bbaf2d6c12474c682a7d665

176 Risk Score

Malware Insights

MITRE ATT&CK

T1203 Exploitation for Client Execution T1059.007 JavaScript

The PDF file contains embedded JavaScript that leverages the CVE-2009-4324 vulnerability via the media.newPlayer method. This exploit is designed to execute arbitrary code, likely to download and run a secondary payload. The JavaScript is obfuscated using String.fromCharCode, indicating an attempt to evade detection.

Machine Learning

Nyx PDF Classifier malicious score 0.9983

Heuristics 6

media.newPlayer — CVE-2009-4324 critical CVE exact CVE_2009_4324

PDF JavaScript calls media.newPlayer — CVE-2009-4324 is a use-after-free in Adobe Reader's multimedia plugin triggered by media.newPlayer(). Actively exploited as a zero-day in December 2009.
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.
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.
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 3

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj0007_000.js` `7ba39a51889d3e29c480aa422c3d83ec0493f020b49082db6b9e663aa758314b`	pdf-javascript-stream	PDF /JS object 7 at offset 0x37B	959 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 3 eval/decoder/string-building token(s).
`javascript_obj0007_001.js` `43d753ed05fa5bb0df5b0aaed68c578071fcad80a8de40170b5dbc57042ebfc3`	pdf-javascript-stream	PDF /JS object 7 at offset 0x37B	202 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s).
`combined_document_js_000.js` `3dfcb890d2326f74c0308c4d463ec6dddae616a88cded06f6231cc6532711c24`	deobfuscated-js	combined document JavaScript streams at offset 0x37B	1162 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 4 eval/decoder/string-building token(s).

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