PDF malware analysis — malicious · f900a4445a8559d4

MALICIOUS

PDF

17.6 KB

MD5: 3dac1e54b9b95b5c5c924f0f50a42ce1 SHA-1: 562ba456ff65dc38ad90cd36582c0c3a125d0c4e SHA-256: f900a4445a8559d4b3f808ea68e35491fc0f5cbf96495397cfb37a25fd07161b

118 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.002 Malicious Link

The PDF sample contains obfuscated JavaScript, triggered by the CVE-2009-4324 vulnerability related to media.newPlayer. The JavaScript utilizes eval() and unescape() functions, indicating an attempt to download and execute a secondary payload. Multiple JavaScript streams were extracted, with some being deobfuscated, further supporting the exploit chain. The primary attack vector appears to be exploiting a known PDF vulnerability to achieve arbitrary code execution.

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` `32641bd411ac9ed980e75861731a0bcf2e0d652a9f6f3e729f187a347ca73258`	pdf-javascript-stream	PDF /JS object 111711 at offset 0x18E	3385 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` `b7fbbfb64e46ae24941603c8067f836592356664d4640f04a8838b9e682135a5`	pdf-javascript-stream	PDF /JS object 111712 at offset 0xEFD	11821 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` `155ca859cae37209f0a14f2d7ecdcf19cd612173e9f8f4d66d972f58214dffde`	pdf-javascript-stream	PDF /JS object 111713 at offset 0x3D60	2190 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).
`legacy_pdfkit_stage_000.js` `3cece914b914841a8b17f6d40f0553e78ef8ed60e76aa68605abeae7e560099e`	deobfuscated-js	multi-marker percent-array decoded JavaScript at offset 0xEFD	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` `fa44c3a6a5df9dd0c4918db03b8a33dc1e24bba8204a13d66510a81c2b2e6f17`	deobfuscated-js	multi-marker percent-array decoded JavaScript at offset 0x3D60	166 bytes
`legacy_pdfkit_stage_002.js` `9780e6fca87db6cdabc38f5ea457071bda02c058b9eab567f74a644cda100664`	deobfuscated-js	multi-marker percent-array combined decoded JavaScript at offset 0xEFD	1248 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s).

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