PDF malware analysis — malicious · 448f12d4cb46dff9

MALICIOUS

PDF

40.2 KB

MD5: b75aef3ac864ff088eff60d5185dd791 SHA-1: ec6c452fab0fd6ea505163945a9d0944262ca46b SHA-256: 448f12d4cb46dff93bd83c9cbca87c95af875e894eb6c9e0e618418d3670f932

168 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.002 Malicious File

The critical heuristic firing for CVE-2009-4324 indicates exploitation of a known vulnerability in PDF documents via the media.newPlayer API. This is further supported by the presence of embedded JavaScript, flagged by multiple heuristics, and identified as a suspicious extracted artifact named 'legacy_pdfkit_stage_000.js'. The JavaScript is likely responsible for downloading and executing a second-stage payload, a common technique for dropper malware. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

Nyx PDF Classifier malicious score 1.0000

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-7255676-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Dropper.Agent-7255676-0
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 3

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj0008_000.js` `b27974e49005d6188c8707cac8fa6ad3e8c162b9d475ccd965a8617a99b856ad`	pdf-javascript-stream	PDF /JS object 8 at offset 0x1E7	2553 bytes
`legacy_pdfkit_stage_000.js` `b6a8a49387c5456dce1de7fa1a17df099302f9375cc08cb2338c2238d8f580b1`	deobfuscated-js	repeated-marker hex decoded JavaScript at offset 0xC14	2516 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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