PDF malware analysis — malicious · 3834c2b9e97cb45e

MALICIOUS

PDF

21.3 KB

MD5: ed39a5f43106600f8b72f33255fed357 SHA-1: 63219e30fe097b74711f12e6e66822bb367ba0cf SHA-256: 3834c2b9e97cb45e4fa57871195da5f4bd1462efaec04ddfa2e01c2811f4bf65

170 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.002 Malicious File

The PDF file contains embedded JavaScript and triggers CVE-2009-4324 via the media.newPlayer alias. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded JavaScript is obfuscated but appears to be designed to download and execute a secondary payload, as suggested by the heuristic firings and the nature of the CVE exploit.

Machine Learning

Nyx PDF Classifier malicious score 0.9999

Heuristics 5

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)
ClamAV: Pdf.Dropper.Agent-7249635-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Dropper.Agent-7249635-0
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` `89a5ed67107b68e8fb3642c68a061bb95f1a72ede103e85962ef9093cb8b4e4d`	pdf-javascript-stream	PDF /JS object 8 at offset 0x1E7	2553 bytes
`javascript_obj0008_001.js` `a6506a256459b9b4f6b0a5ea63fc48dbaef86dc3528a55e92bbfb2ef4a967bd7`	pdf-javascript-stream	PDF /JS object 8 at offset 0x209	21341 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 long base64-like blob(s).
`legacy_pdfkit_stage_000.js` `2ba68089bfe7009b0e464ddc8ecdbd157a87f4c07872fbef90f5b3877fe0ccd6`	deobfuscated-js	repeated-marker hex decoded JavaScript at offset 0xC14	1232 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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