PDF / .TXT malware analysis — malicious · 429750418a512fe9

MALICIOUS

PDF / .TXT

80.3 KB

MD5: d517e12abf8c7706f427658e88aff79f SHA-1: 1697496a25f971f8794d78a388d7b2c6d8acdb4e SHA-256: 429750418a512fe9975d4c24b892aa2c3393b50066f92b2fb4c11aa07577fbfc

78 Risk Score

Malware Insights

MITRE ATT&CK

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

The PDF sample contains embedded JavaScript, indicated by the PDF_JAVASCRIPT and PDF_JS heuristics. A critical heuristic firing for CVE-2009-4324 suggests the sample exploits a vulnerability in the media.newPlayer API to launch this script. The deobfuscated JavaScript, found in legacy_pdfkit_stage_000.js, likely downloads and executes a second-stage payload. The extracted artifact name 'legacy_pdfkit_stage_000.js' further supports this. The DOC BODY content is heavily obfuscated and does not provide clear user-facing text.

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` `49df17311e628346cb7f4317457dea40e6f221f7ea4ce4e3e4fb7c2c76cb2b1a`	pdf-javascript-stream	PDF /JS object 8 at offset 0x217	3783 bytes
`legacy_pdfkit_stage_000.js` `2fdabff677ccce7076a8b35c815377bbd0cecaf7bcf5bcbd8245694150d71bf6`	deobfuscated-js	repeated-marker hex decoded JavaScript at offset 0x111A	2586 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 0x217	81 bytes

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