PDF malware analysis — malicious · ba1a131b6c63a51a

MALICIOUS

PDF

17.2 KB

MD5: e5ef72fac9304aa9b782032e47ad7c41 SHA-1: c52520c41f63664e011e44f9c7b0fdbce13fdb25 SHA-256: ba1a131b6c63a51a2f81f953bd982594d8118f9db77a18ede762f8d75625663d

148 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.001 Malicious Link

The PDF sample contains multiple embedded JavaScript streams, with critical heuristics indicating the use of `eval()` and `unescape()` functions, along with a specific CVE-2009-4324 trigger related to `media.newPlayer`. The JavaScript appears to be heavily obfuscated, but the core functionality involves reconstructing strings and executing them via `eval`. This pattern strongly suggests the script is designed to download and execute a second-stage payload from a remote source, exploiting the CVE-2009-4324 vulnerability in older Adobe Reader versions.

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` `a0511aa0c8f98d6dbaccd2581b69dfc6fe76a92d78f0bdd5f8536cf2d2ca4838`	pdf-javascript-stream	PDF /JS object 111711 at offset 0x18E	3288 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` `a5c998b26e8bf41f90717444ebe2da7b80735bcaee47e12b7998d02025a6744d`	pdf-javascript-stream	PDF /JS object 111712 at offset 0xE9C	11121 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` `e4b6aeffcad06383b2a6f22939c429309e49ce1a44294fd381bd5d80943b19c6`	pdf-javascript-stream	PDF /JS object 111713 at offset 0x3A43	2617 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).
`legacy_pdfkit_stage_000.js` `27920ea41782e3de7681655436ad162917290e5898d36303bc383088d7d66d85`	deobfuscated-js	multi-marker percent-array decoded JavaScript at offset 0xE9C	1075 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` `5091795dc7dfd1e269d30a5ab394f1536cab6157b0cb74b7e26a9fdc9129a46f`	deobfuscated-js	multi-marker percent-array decoded JavaScript at offset 0x3A43	165 bytes
`legacy_pdfkit_stage_002.js` `6ffbce12d546d7ace80bcfa4f7812e00446b07aed5fe63028931fa6d9d67b80f`	deobfuscated-js	multi-marker percent-array combined decoded JavaScript at offset 0xE9C	1241 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s).

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