PDF malware analysis — malicious · 9df4b4b91aec6277

MALICIOUS

PDF

21.5 KB

MD5: 60408dbf668afaa6ccba92dfef5bf6ef SHA-1: 592bd8fe42a3ff56a5fe06c8556e72932e9cc83c SHA-256: 9df4b4b91aec6277ef7892779ec1b56e403c2599056205b6d22675406c198c91

78 Risk Score

Malware Insights

MITRE ATT&CK

T1204.002 Malicious File T1059.001 PowerShell

The PDF file contains embedded JavaScript, indicated by the PDF_JAVASCRIPT and PDF_JS heuristics. The critical CVE-2009-4324 heuristic specifically points to the exploitation of a vulnerability related to media.newPlayer, which is often used to launch malicious scripts. The deobfuscated JavaScript likely attempts to download and execute a secondary payload, as suggested by the 'Suspicious extracted artifact' finding. The reconstructed JavaScript string 'app["v"+"ie"+"werTy"+app.doc.URL[3]+"e"][1]' likely refers to a method for executing code within the Adobe Reader environment.

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` `26eb9fae12f479c8976fd73e79dbf26aed88f81e935fb9d6a1927e3c7247d11f`	pdf-javascript-stream	PDF /JS object 8 at offset 0x1E7	2221 bytes
`legacy_pdfkit_stage_000.js` `630bbd87d4c991442612bbfc5d0e64a58d98100212c3f8e897f80b45684ffd16`	deobfuscated-js	repeated-marker hex decoded JavaScript at offset 0xAC8	1262 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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