PDF malware analysis — malicious · 51a80fe11cd400d6

MALICIOUS

PDF

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

MD5: 073773c41ae301fa833f9ff5ec44f1ae SHA-1: bab2e3cf7fb70df591466e5ed7f1c09d55abf720 SHA-256: 51a80fe11cd400d6abbe10693d6e124e01f7f0d05b56569f71ea2601a0b1e420

128 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1027 Obfuscated Files or Information

The PDF file contains embedded JavaScript streams that are heavily obfuscated using eval() and unescape() functions. The ML classifier strongly indicates maliciousness. The presence of these functions and the ML score suggest the script is designed to download and execute a secondary payload. No specific family could be identified due to the obfuscation.

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` `9fcfd3945f0965cca078c0ea1947774ba9e8519730739c98f78d006d150be032`	pdf-javascript-stream	PDF /JS object 7 at offset 0x215	35626 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s).
`javascript_obj0007_001.js` `b32c605f6d143c832945825899c498b68529a902a5742a1b96ba9259303bf705`	pdf-javascript-stream	PDF /JS object 7 at offset 0x215	35539 bytes

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