PDF malware analysis — malicious · 2513b41c61221c42

MALICIOUS

PDF

17.8 KB

MD5: cddb991d486ce9bb253c142d874e622c SHA-1: cddda47d1ef1f17ed76efa7d92031eccf6282780 SHA-256: 2513b41c61221c423ea1019ad78ad36d84f53cdd5523475a6c66f9d2506bab9f

118 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.001 Malicious Link

The PDF file contains embedded JavaScript that leverages the CVE-2009-4324 vulnerability, specifically targeting the media.newPlayer API. The JavaScript is heavily obfuscated using string concatenation and eval() calls, making it difficult to fully deobfuscate. However, the presence of eval() and the exploit trigger strongly suggest that the script's primary purpose is to download and execute a secondary payload. The heuristics indicate multiple JavaScript streams and deobfuscated JS files, further supporting this conclusion.

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` `164f7641795b40bc18da82e31c749d0755d4854eabc7744228828a24e01f6d81`	pdf-javascript-stream	PDF /JS object 111711 at offset 0x18E	2995 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` `76fbe83a652b007f592e752e065cc8da197b7f2871d125e0f8d402596d43a306`	pdf-javascript-stream	PDF /JS object 111712 at offset 0xD77	12464 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_obj111713_002.js` `b822b8528b5df8f113eb9e372a0bee1adb65cf8057c650118dbecef9a387cc25`	pdf-javascript-stream	PDF /JS object 111713 at offset 0x3E5D	2157 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` `58ebe5dbdd4e1df1b7a2fd88981ab9a11d1345bc233399b565080982610cd43a`	deobfuscated-js	multi-marker percent-array decoded JavaScript at offset 0xD77	1084 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` `5091795dc7dfd1e269d30a5ab394f1536cab6157b0cb74b7e26a9fdc9129a46f`	deobfuscated-js	multi-marker percent-array decoded JavaScript at offset 0x3E5D	165 bytes
`legacy_pdfkit_stage_002.js` `d26dc74d2f1fc5dfc11986f3ac59615d14238109963ef104329ca22cef2af5a4`	deobfuscated-js	multi-marker percent-array combined decoded JavaScript at offset 0xD77	1250 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s).

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