PDF malware analysis — malicious · 50b20d3e0744ffcf

MALICIOUS

PDF

46.2 KB

MD5: 87ea4a8ed1d4a8046a7573855800b993 SHA-1: 58983d02c70d1b807754f9719fd0e79c70dcb68f SHA-256: 50b20d3e0744ffcfc9ecc7bdfa82a283490d3822b1532d5d532621a7fc92ce3b

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. A critical heuristic identifies the CVE-2009-4324 exploit using the media.newPlayer vulnerability. The deobfuscated JavaScript, legacy_pdfkit_stage_000.js, appears to be designed to download and execute a second-stage payload, as suggested by the heuristic 'Suspicious extracted artifact — Signals: Script obfuscation indicators; files: legacy_pdfkit_stage_000.js'. The obfuscated nature of the script and the use of a known PDF exploit point towards a downloader or dropper functionality.

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` `e4ab3b6fa6590b35809b5332875f13493d5577b23664376337ffc700a87ea75b`	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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