PDF malware analysis — malicious · 9ce8f1992146a788

MALICIOUS

PDF

14.6 KB

MD5: a8b860ac8ff81281a87d60970a353c82 SHA-1: c0ca1badef9bf90b5b4746b95945827d95fb7d24 SHA-256: 9ce8f1992146a788c14f71967d59149016fdf17277dd9b4e36275797afd66278

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, and PDF_EVAL. The critical CVE_2009_4324 firing points to the use of the media.newPlayer sink to trigger an exploit. The JavaScript employs string concatenation and encoding techniques, such as 'v'+'ar '+'Gu9Le68bMi'+' ='+' e'+'v'+'a'+'l;', to hide its malicious intent. The reconstructed JavaScript functions `eval()` and `unescape()` are used to deobfuscate and execute code, likely leading to the download and execution of a secondary payload. The presence of multiple deobfuscated JavaScript files further supports this. No specific family could be identified.

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` `13a5960761dbac93ca3b614e603f81d06ad83b04579fe45e5d80bd2ff2c53ad8`	pdf-javascript-stream	PDF /JS object 111711 at offset 0x18E	2968 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` `012fce5474487e2dca6705b50cf0c8e03709fa594202f52ec8e851429f5ab0dc`	pdf-javascript-stream	PDF /JS object 111712 at offset 0xD5C	9227 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_obj111713_002.js` `fb891fa9b5a4bc5360b4c80e3f7cc88e73cc17a4a943e698e8a2d6214decab0f`	pdf-javascript-stream	PDF /JS object 111713 at offset 0x319D	2206 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 0xD5C	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` `cd7088aa0ba5ce42db7faac79c4063dccc339c8953139714658e9cb6b07c91fc`	deobfuscated-js	multi-marker percent-array decoded JavaScript at offset 0x319D	165 bytes
`legacy_pdfkit_stage_002.js` `323c6ce3f5bdec0f0b1b46427d81d56be2a318650a0a004998082b9d17c39310`	deobfuscated-js	multi-marker percent-array combined decoded JavaScript at offset 0xD5C	1247 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s).

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