PDF malware analysis — malicious · b51c05fd1224ec99

MALICIOUS

PDF

19.4 KB

MD5: f387c71cb38d2b9b3097f606965eb5e8 SHA-1: c217bc3f6c16a7f8a2ea7116823cbee3101e4594 SHA-256: b51c05fd1224ec99382d34faa232d5d1025d27cbdb64af1535e89ff9bcbcf068

148 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.001 Malicious Link

The PDF file contains obfuscated JavaScript, including multiple eval() calls and string concatenations, which is a common technique for exploiting vulnerabilities and delivering secondary payloads. The critical CVE_2009_4324 heuristic indicates a specific exploit targeting the media.newPlayer functionality. The embedded JavaScript streams and deobfuscated JS files suggest the primary goal is to execute malicious code, likely downloading further stages from a remote source. The ML classifier strongly supports the malicious nature of this PDF.

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` `34431d7b4d3deae982c9f641bb65249659db1f8d249cd551232319f5f8777273`	pdf-javascript-stream	PDF /JS object 111711 at offset 0x18E	3045 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` `c2e25f24ca6a5030f90b5bdd7960e37b29fe7c8c87fd9c349273a697fb2f9cc3`	pdf-javascript-stream	PDF /JS object 111712 at offset 0xDA9	13799 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` `bdaa1d080f75123e65a4ff16564371eac8a0fb77ff3fd2848941e46a5a5ef42f`	pdf-javascript-stream	PDF /JS object 111713 at offset 0x43C6	2470 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 0xDA9	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` `30eb0520fb531f2388f6456aa1cb9929d85b500523231fa1f134d9f294f13e12`	deobfuscated-js	multi-marker percent-array decoded JavaScript at offset 0x43C6	174 bytes
`legacy_pdfkit_stage_002.js` `e7b0983d4a07a8d1675ea3d7438b0d9712a27debf1877a3e9aa6cf98c13c2af6`	deobfuscated-js	multi-marker percent-array combined decoded JavaScript at offset 0xDA9	1256 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s).

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