PDF malware analysis — malicious · c00c037ff34a0e33

MALICIOUS

PDF

35.5 KB Created: 2009-05-01 21:21:45 Authoring application: tvEeSFCPx (via NeTSnrx)

MD5: 2da1ddee03b97ed92918ed35385958f0 SHA-1: 402dd4965e62b0e41892891e7b1795c365b5cd40 SHA-256: c00c037ff34a0e3395e724bc191b00b9fdf649ae48b10865901c29caa00990fa

128 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 Command and Scripting Interpreter: PowerShell T1059.003 Command and Scripting Interpreter: Windows Command Shell T1059.007 Command and Scripting Interpreter: JavaScript/TypeScript

The PDF contains embedded JavaScript, which is heavily obfuscated and utilizes eval() and unescape() functions. This strongly suggests the script is designed to deobfuscate and execute malicious code, likely downloading and running a second-stage payload. The ML classifier also flagged this PDF as malicious with high confidence. Due to the obfuscation, the exact nature of the payload cannot be determined from static analysis alone.

Machine Learning

Nyx PDF Classifier malicious score 1.0000

Heuristics 5

eval() call high PDF_EVAL

eval() found — commonly used for obfuscated exploit execution
unescape() call high PDF_UNESCAPE

unescape() found — often used to decode shellcode in PDF JS exploits
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 2

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj0007_000.js` `a3b5bdccb204156a42b9991e2885b8b8c872fc3d695b5b5ec4720086e42c6f70`	pdf-javascript-stream	PDF /JS object 7 at offset 0x215	35126 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s).
`javascript_obj0007_001.js` `b5386b87c241a52c697b4fff1e0bf0f12df057246a1ce5a58ba55500ee346b08`	pdf-javascript-stream	PDF /JS object 7 at offset 0x215	35039 bytes

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