PDF malware analysis — malicious · 99cbcd445bcd3bc3

MALICIOUS

PDF

17.8 KB

MD5: d917b148f3f4266cf8bf702da7fbc7a4 SHA-1: a7073f8ea3b0083fa7c02e14859ab9ec2fc3c6c7 SHA-256: 99cbcd445bcd3bc39bdb084eb77001355aa9fe601d9fb8e09c7859afd21f112a

148 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.001 Malicious Link

This PDF exploits CVE-2009-4324 using obfuscated JavaScript. The JavaScript employs eval() and unescape() functions, along with string concatenation, to hide its malicious intent. The primary goal appears to be the execution of a second-stage payload, as indicated by the 'legacy_pdfkit_stage' filenames and the ML classifier's high confidence score. The use of 'media.newPlayer' is a direct indicator of the CVE-2009-4324 exploit.

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` `60d612d06dc96af4b48c47ca10bfddb5b7060cf836e193db928ba9f0b0b8b33f`	pdf-javascript-stream	PDF /JS object 111711 at offset 0x18E	3027 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` `d33c4b4118e6c997de7ee66c11bcd5414f3473ac860c03ded0c33bdbff0a2495`	pdf-javascript-stream	PDF /JS object 111712 at offset 0xD97	12064 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` `1772d3f7691abfbffcfb12b019df93661cbf754b7996365087baaa82668e1629`	pdf-javascript-stream	PDF /JS object 111713 at offset 0x3CED	2557 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` `678c1bb7dda8f74045663a886a47cedc38262c0b87aa4c3a8ce3689845e3f481`	deobfuscated-js	multi-marker percent-array decoded JavaScript at offset 0xD97	1077 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` `cd7088aa0ba5ce42db7faac79c4063dccc339c8953139714658e9cb6b07c91fc`	deobfuscated-js	multi-marker percent-array decoded JavaScript at offset 0x3CED	165 bytes
`legacy_pdfkit_stage_002.js` `55ac7d9b79fa3f3f6e99d8fdffdb2eb5a21f34ab54720808e1d43e59c22f6b1f`	deobfuscated-js	multi-marker percent-array combined decoded JavaScript at offset 0xD97	1243 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s).

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