PDF malware analysis — malicious · cd1639f4a9a1dc32

MALICIOUS

PDF

17.6 KB

MD5: 42432ec464570d4f9b0d4dac28d6cedb SHA-1: af3f337050580406ffc563a1336ee9a6d0809345 SHA-256: cd1639f4a9a1dc32c0316498752a9c2de5813f5db0425638b9c74fcbda03d4c5

118 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.001 Malicious Link

The PDF file contains embedded JavaScript that utilizes the 'eval()' function and 'unescape()' to deobfuscate and execute malicious code. The critical heuristic firing for CVE-2009-4324 indicates exploitation of the media.newPlayer vulnerability. The deobfuscated JavaScript streams suggest the primary goal is to download and execute a secondary payload, a common technique for initial access.

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` `0d746d3a9d3c76acdb6815e987591903c4678784849ee4fe6cf383e167db7557`	pdf-javascript-stream	PDF /JS object 111711 at offset 0x18E	2928 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` `927cc48e79cb214027b7d07bbc8e9aa9be67ed5278d27b11e7f4d9965aaad9c8`	pdf-javascript-stream	PDF /JS object 111712 at offset 0xD34	12244 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` `cd725accf3c974156468b7c50024680047a56de3ff73c82bcccd011477a43fff`	pdf-javascript-stream	PDF /JS object 111713 at offset 0x3D3E	2278 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` `9d7b1c0dad10a574a51cfe691e7caa5679020547466de24deb06f439abed1d53`	deobfuscated-js	multi-marker percent-array decoded JavaScript at offset 0xD34	1089 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 0x3D3E	165 bytes
`legacy_pdfkit_stage_002.js` `b67daaf46e4118cb25ca0ec9286461f1739d6d544d24d9a1e7912ae712917416`	deobfuscated-js	multi-marker percent-array combined decoded JavaScript at offset 0xD34	1255 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s).

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