PDF malware analysis — malicious · efefc28dbc599f01

MALICIOUS

PDF

17.4 KB

MD5: ccba5d021159fe1e3f0feffad57f63db SHA-1: 578ca5dbe9facf432e02942e366832424f67ba87 SHA-256: efefc28dbc599f01df3a8a0155ddb853a8b4c742c4f491403956d3ab8e4d31aa

118 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.001 Malicious Link

The PDF sample contains obfuscated JavaScript, indicated by multiple heuristic firings including PDF_JAVASCRIPT, PDF_JS, PDF_EVAL, and a critical hit for CVE_2009_4324. The embedded JavaScript uses eval() and unescape() functions, and string concatenation to hide its malicious intent. The primary function of the script appears to be exploiting CVE-2009-4324 via the media.newPlayer API to download and execute a secondary payload. The reconstructed string literals within the script, such as 'eval()', 'unescape()', and 'String', are indicative of this obfuscation technique.

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` `25d770112ba562b1f2dc00219fb4ab43abb9d37954f92316c81b820b06745dc0`	pdf-javascript-stream	PDF /JS object 111711 at offset 0x18E	2514 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_obj111712_001.js` `266d4b20dd49152d4d4581f9b2153ac703a3b1bfce956f589f7abe167497a70f`	pdf-javascript-stream	PDF /JS object 111712 at offset 0xB96	12369 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).
`javascript_obj111713_002.js` `dd3329fb7b9062943d60be2e51224ded414ecd6002dd9be143bba375e9d9f7f4`	pdf-javascript-stream	PDF /JS object 111713 at offset 0x3C1D	2364 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` `27920ea41782e3de7681655436ad162917290e5898d36303bc383088d7d66d85`	deobfuscated-js	multi-marker percent-array decoded JavaScript at offset 0xB96	1075 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` `daecc95cffba134626ae8747c446475202eebcaa6e945a4b283a586be10374ea`	deobfuscated-js	multi-marker percent-array decoded JavaScript at offset 0x3C1D	169 bytes
`legacy_pdfkit_stage_002.js` `32a5e634a7394e17df3c4b078201afa61f8dab9fcd1fb15e37e708127c42dee1`	deobfuscated-js	multi-marker percent-array combined decoded JavaScript at offset 0xB96	1245 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s).

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