PDF malware analysis — malicious · 21c2cdd8b5f16aec

MALICIOUS

PDF

17.0 KB

MD5: fe425a5659dd7067ee4b3df4cc78b0a0 SHA-1: bde9e64bf3456d236753a97a2e741b3f29bdd399 SHA-256: 21c2cdd8b5f16aec57ed75c79c3eaffad7dc37f6bebf0ba9db79071b7a610519

148 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.002 Malicious File

This PDF document contains obfuscated JavaScript, which is executed using eval() and unescape() functions. The critical CVE_2009_4324 heuristic indicates a known exploit for Adobe Reader, specifically targeting the media.newPlayer function. The embedded JavaScript streams and deobfuscated stages suggest the primary intent is to download and execute a second-stage payload, likely exploiting this vulnerability.

Machine Learning

Nyx PDF Classifier malicious score 1.0000

Heuristics 5

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)
eval() call high PDF_EVAL

eval() found — commonly used for obfuscated exploit execution
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 6

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj111711_000.js` `2917b21820920a3b6f14da7207121e5c47e51ebc0fff2529e2f198c0aa34c9b0`	pdf-javascript-stream	PDF /JS object 111711 at offset 0x18E	2636 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s). Carved artifact contains 6 long base64-like blob(s).
`javascript_obj111712_001.js` `1e5b4ba0a7177777870bab55e5fe4fec8acdc855a9c7af8d61a6283e2f241c71`	pdf-javascript-stream	PDF /JS object 111712 at offset 0xC10	11503 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s). Carved artifact contains 4 long base64-like blob(s).
`javascript_obj111713_002.js` `6eeb2abd6aeabe23624707746c4c60311859763a95d9b4a1ba64951dfbf90978`	pdf-javascript-stream	PDF /JS object 111713 at offset 0x3935	2651 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s). Carved artifact contains 5 long base64-like blob(s).
`legacy_pdfkit_stage_000.js` `3cece914b914841a8b17f6d40f0553e78ef8ed60e76aa68605abeae7e560099e`	deobfuscated-js	multi-marker percent-array decoded JavaScript at offset 0xC10	1081 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` `cd7088aa0ba5ce42db7faac79c4063dccc339c8953139714658e9cb6b07c91fc`	deobfuscated-js	multi-marker percent-array decoded JavaScript at offset 0x3935	165 bytes
`legacy_pdfkit_stage_002.js` `323c6ce3f5bdec0f0b1b46427d81d56be2a318650a0a004998082b9d17c39310`	deobfuscated-js	multi-marker percent-array combined decoded JavaScript at offset 0xC10	1247 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s).

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