PDF malware analysis — malicious · 4ac8d3af176ce37b

MALICIOUS

PDF

79.1 KB

MD5: 8834268bd7695128794f8a5be509982a SHA-1: 88b8b7d0dfcc23777fc19a40e57e3406f4bb937f SHA-256: 4ac8d3af176ce37b1227b0c4d618b85ec8d8483ec3a7141b26fe880cdfc32ad5

78 Risk Score

Malware Insights

MITRE ATT&CK

T1204.002 Malicious File: Malicious File

The PDF file contains embedded JavaScript, indicated by multiple heuristic firings. Specifically, the CVE-2009-4324 heuristic points to the exploitation of a known vulnerability related to media player functionality within PDF viewers. The deobfuscated JavaScript file 'legacy_pdfkit_stage_000.js' is present, suggesting it is the primary component for executing the malicious action. The script's likely purpose is to download and execute a secondary payload, a common technique for initial access.

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` `f8e80160b645e5bfb5950f54cacecb776ad40c13ba24967ff49802df858940ec`	pdf-javascript-stream	PDF /JS object 8 at offset 0x1E7	3583 bytes
`legacy_pdfkit_stage_000.js` `b5357306cfb10a2f5c2f33c6b40440fc3ecd841bd90a4cfdd9f700a7d9c0b30d`	deobfuscated-js	repeated-marker hex decoded JavaScript at offset 0x101A	2552 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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