PDF malware analysis — malicious · f5d8f7326ba5d03c

MALICIOUS

PDF

1.9 KB

MD5: 0ea3396573d006778f08ed1eb15fcd74 SHA-1: a24748d107d01482badc02d36d246e3c497c8360 SHA-256: f5d8f7326ba5d03c8eb0881dd111dcedd9f4b4f5215bee454d8bc5378fc8fe41

188 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1140 Deobfuscate/Decode Files or Information

The PDF contains embedded JavaScript, flagged by multiple heuristics including PDF_JAVASCRIPT and PDF_JS. High-severity heuristics like PDF_EVAL and PDF_UNESCAPE indicate obfuscated code execution. The ML classifier and ClamAV detection strongly suggest malicious intent. The embedded JavaScript likely downloads and executes a second-stage payload, as indicated by the ML_NYX_PDF_MALICIOUS and CLAMAV_DETECTION findings.

Machine Learning

Nyx PDF Classifier malicious score 1.0000

Heuristics 6

ClamAV: Pdf.Exploit.Agent-35930 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Exploit.Agent-35930
eval() call high PDF_EVAL

eval() found — commonly used for obfuscated exploit execution (matched inside decoded stream)
unescape() call high PDF_UNESCAPE

unescape() found — often used to decode shellcode in PDF JS exploits (matched inside decoded stream)
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_obj111611_000.js` `f23e505f155bfa9b9f356fa9fddf8d7fcafcc37fc2df3878e575e72c00c819d4`	pdf-javascript-stream	PDF /JS object 111611 at offset 0x669	697 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 3 eval/decoder/string-building token(s).
`legacy_pdfkit_stage_000.js` `76296fd7dbac8d46a1e53880520db0e9e408fcfe445e84845529e227404c0216`	deobfuscated-js	repeated-marker hex decoded JavaScript at offset 0x189	2822 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 3 eval/decoder/string-building token(s). Carved artifact contains 1 long base64-like blob(s).

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