PDF malware analysis — malicious · 501f98c3d9ba5941

MALICIOUS

PDF

43.2 KB

MD5: 13cd79ff614547aebb1b0d04f80c07d7 SHA-1: 13a0887be2f05f469bd4ffd676dedd63c2696507 SHA-256: 501f98c3d9ba59419d49034ba08a6d669d5c302894bc3e2bdab4feb73d757940

108 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 JavaScript T1204.002 Malicious JavaScript

The PDF file contains embedded JavaScript and triggers CVE-2009-4324 via the media.newPlayer API. The ML classifier strongly indicates maliciousness. The embedded JavaScript is likely responsible for downloading and executing a secondary payload, as suggested by the heuristic firings and the presence of multiple JavaScript streams.

Machine Learning

Nyx PDF Classifier malicious score 1.0000

Heuristics 4

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. (identified after JavaScript deobfuscation)
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 4

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj0008_000.js` `44721be25021b8664316a1513bf18a384a8f5e8facb47e4ad2235667604af1a0`	pdf-javascript-stream	PDF /JS object 8 at offset 0x1E7	2205 bytes
`javascript_obj0008_001.js` `c15e77876051e44db911a4be1b8313b6db6f9bda90e09a97b114efed10b8dbf3`	pdf-javascript-stream	PDF /JS object 8 at offset 0x209	43673 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 long base64-like blob(s).
`legacy_pdfkit_stage_000.js` `e25eb9dea927fc4a67324232040e7bccd1874be12a367fce24d0ca6ae7a3286e`	deobfuscated-js	repeated-marker hex decoded JavaScript at offset 0xAB8	2744 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s).
`legacy_pdfkit_stage_001.js` `42025b552c7960b53abcd8cd732b01c8d109eccfdfefc352b9826c4d5807d414`	deobfuscated-js	cross-stage annotation API aliases at offset 0x1E7	81 bytes

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