PDF malware analysis — malicious · 9b3f0be9c0bc54ac

MALICIOUS

PDF

43.0 KB

MD5: eb9511d026133224852998716ce2cbca SHA-1: dfb885e8f3a9ccf4e7c0ef393f2eb000854402b4 SHA-256: 9b3f0be9c0bc54acaccd63b812aec69bfadc1128a454629031168bfe2bedb9ae

228 Risk Score

Malware Insights

MITRE ATT&CK

T1204.002 Malicious File T1059.001 JavaScript

This PDF file is flagged as malicious by multiple engines, including ClamAV which identifies it as Win.Trojan.Agent-36169. The critical heuristic CVE_2009_4324 indicates exploitation of a known vulnerability in the PDF reader's media player functionality. Embedded JavaScript streams were extracted, with one deobfuscated file (legacy_pdfkit_stage_000.js) suggesting the execution of further malicious code. The script's obfuscated nature and the presence of multiple extracted JavaScript files indicate a multi-stage attack designed to download and execute a secondary payload.

Machine Learning

Nyx PDF Classifier malicious score 1.0000

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. (identified after JavaScript deobfuscation)
ClamAV: Win.Trojan.Agent-36169 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Win.Trojan.Agent-36169
ClamAV detection on extracted artifact critical EXTRACTED_FILE_CLAMAV

ClamAV flagged at least one file extracted from inside this sample. Even when the wrapping document carries no AV detection of its own, a hit on the carved artifact is a strong indicator the sample is a delivery vehicle.
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 3

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj0008_000.js` `eccc871586393ee9657562d17e01f13de2c524174304b1a2c18c0ddd78980d66`	pdf-javascript-stream	PDF /JS object 8 at offset 0x1E7	2019 bytes
Detection ClamAV: Win.Trojan.Agent-36169 Obfuscation or payload: unlikely
`legacy_pdfkit_stage_000.js` `81753f58feed98d827d1892e084088c2f1e4042854e1b7dbfcae4acbb858502e`	deobfuscated-js	repeated-marker hex decoded JavaScript at offset 0x9FE	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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