PDF malware analysis — malicious · c81eb37a0da6f5d3

MALICIOUS

PDF

92.2 KB

MD5: d0a2bd666b2aee675c9150c8a1f7a3b0 SHA-1: 5286c2ab651eec4cedb520fc1717fca8f8819f07 SHA-256: c81eb37a0da6f5d3fc14591f2128c834d79ac2208275046fdc87431e70ea7a12

78 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.002 Malicious File

The PDF document contains embedded JavaScript, indicated by 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 used to launch embedded scripts. The deobfuscated JavaScript, legacy_pdfkit_stage_000.js, contains obfuscated code that attempts to construct and execute commands, likely for downloading and executing a secondary payload. The presence of script obfuscation indicators further supports this. The reconstructed string "/hi av hax" is suspicious and may be part of a command or URL.

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` `e598e1394999dde535a717ff924e2e49b4bba6169623e16673df074c14db9bc8`	pdf-javascript-stream	PDF /JS object 8 at offset 0x1E7	2578 bytes
`legacy_pdfkit_stage_000.js` `fbac795adc7cea718b8ae4b1ca8e9752f7cbfedaf4162134e8d0fb8d72150ac6`	deobfuscated-js	repeated-marker hex decoded JavaScript at offset 0xC2D	2528 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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