PDF malware analysis — malicious · cb3841561b53b13b

MALICIOUS

PDF

40.0 KB

MD5: eb0912c4d2912a897ddc65e6f31b751c SHA-1: 91a5bca35c960f5b9e17b13cf0d6b9fada23eff4 SHA-256: cb3841561b53b13b7e02af641fd2db43d7a4ca3f305f864c5b762d5d8412bd9a

228 Risk Score

Malware Insights

MITRE ATT&CK

T1204.002 Malicious File: User Execution T1059.001 Command and Scripting Interpreter: JavaScript T1059.003 Command and Scripting Interpreter: Windows Command Shell

This PDF file is flagged as malicious by multiple engines, including ClamAV, and exhibits characteristics of exploit delivery. The presence of embedded JavaScript and a critical heuristic firing for CVE-2009-4324 (media.newPlayer) indicates the document is designed to exploit a vulnerability. The embedded JavaScript, particularly the reconstructed string "http://BhQswTovvY89[7]BhQswTovvY89[8]BhQswTovvY89[8]/BhQswTovvY89[9]BhQswTovvY89[10];", strongly suggests the script's intent is to download and execute a second-stage payload from a remote server. The ML classifier also gives a very high probability of maliciousness.

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` `9171204d717e2a51fa83c4a890a213020f6980ef69923a55cc5c06a90754a29a`	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` `a849a94050ea3c5631a53f768b6256f28e80f91ad5750d210ae3ef91c31455c1`	deobfuscated-js	repeated-marker hex decoded JavaScript at offset 0x9FE	2540 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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