PDF malware analysis — malicious · f9864c297e64edb7

MALICIOUS

PDF

18.0 KB

MD5: 97c8784f6d80ca640096d36cd7cb3abe SHA-1: 66c43677fc8903f8608ccf4329f2135b5192ca57 SHA-256: f9864c297e64edb70cffbd12742e23daecbe309ae718954391e36b274ae072ed

118 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.001 Malicious Link T1071.001 Web Protocols

The PDF document contains obfuscated JavaScript that utilizes eval() and unescape() functions, indicative of malicious intent. The critical heuristic firing for CVE-2009-4324 confirms the exploitation of a known vulnerability in PDF viewers. The deobfuscated JavaScript suggests the execution of further stages, likely involving downloading and running additional payloads from external sources. The presence of multiple JavaScript streams and deobfuscated JS files further supports this analysis.

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` `56cd58f474871b7983817dc16d2b8533460323428a6a0616d00637386b42e2cb`	pdf-javascript-stream	PDF /JS object 111711 at offset 0x18E	3039 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_obj111712_001.js` `46c539b51ffeb9382f2976f369043c05f5a9764e170b2649e3bac6dcfb094aee`	pdf-javascript-stream	PDF /JS object 111712 at offset 0xDA3	12294 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` `0577aa9d9b8f643a22d7b451b032f2ca8df1f9b15f80e5dd10f446d2e6b1a932`	pdf-javascript-stream	PDF /JS object 111713 at offset 0x3DDF	2535 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 0xDA3	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` `a3d2e01bde6752390f561f2de9588c8ba1cdbb25321c55fc604f21706a6a2e9c`	deobfuscated-js	multi-marker percent-array decoded JavaScript at offset 0x3DDF	169 bytes
`legacy_pdfkit_stage_002.js` `074eb1bda113f8fcddc112b20bd3952456b57ce90d62cd7d5dcabbdb0e617a20`	deobfuscated-js	multi-marker percent-array combined decoded JavaScript at offset 0xDA3	1251 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s).

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