PDF malware analysis — malicious · d851366a3e108f23

MALICIOUS

PDF

46.2 KB

MD5: 74dc8ed44a769ee51d12aa1b653e9d83 SHA-1: 0d094e61f52d59b5266d80fa87f484f4d7a94eb9 SHA-256: d851366a3e108f2394a049b113044b0e4ee6d8f1fd9e4f5d12ff239a8bb8142f

78 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 JavaScript T1204.002 Malicious File

The PDF document contains embedded JavaScript, indicated by multiple heuristic firings including PDF_JAVASCRIPT and PDF_JS. A critical heuristic identified the CVE-2009-4324 exploit targeting the media.newPlayer API. The deobfuscated JavaScript, named legacy_pdfkit_stage_000.js, likely facilitates the execution of malicious code. The primary intent appears to be exploiting this CVE to download and execute a secondary payload.

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 3

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj0008_000.js` `f6b5f46e3a1a9af9ddefc8dafc59d39f06bd53e9530f273e4cb89e366dcd8c57`	pdf-javascript-stream	PDF /JS object 8 at offset 0x1E7	2578 bytes
`legacy_pdfkit_stage_000.js` `d7155f873b59e589a73c704be477a30cf4921d43cb2c81abc4b0960cad6f3280`	deobfuscated-js	repeated-marker hex decoded JavaScript at offset 0xC2D	1220 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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