PDF malware analysis — malicious · 37f2f3f973ec9a21

MALICIOUS

PDF

345.8 KB

MD5: ee4a4c5057547810c8a28e12f5b89281 SHA-1: 604056b26065c5153ce9c7dedb00cddf39a46ab9 SHA-256: 37f2f3f973ec9a21020ee1be0a44d7365276d0fcf6c46b67ddb8db305c9a6857

168 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 JavaScript T1204.002 Malicious JavaScript

This PDF file was flagged as malicious by multiple heuristics, including ML classification and ClamAV detection (Pdf.Exploit.Agent-36189). It contains embedded JavaScript streams that utilize unescape() calls and ASCIIHexDecode filters, indicating an attempt to obfuscate malicious code. The presence of these elements strongly suggests the PDF is designed to exploit a vulnerability and execute a secondary payload, likely downloaded from an external source.

Machine Learning

Nyx PDF Classifier malicious score 0.9999

Heuristics 6

ClamAV: Pdf.Exploit.Agent-36189 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Exploit.Agent-36189
unescape() call high PDF_UNESCAPE

unescape() found — often used to decode shellcode in PDF JS exploits (matched inside decoded stream)
ASCIIHexDecode filter (with exploit indicators) medium PDF_FILTER_HEX

Hex-encoding filter present alongside exploit delivery indicators — often used to hide payload or shellcode bytes
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_obj0008_000.js` `fd5622158667d315e30e8ca3248f5044044c08ea08248a4208dfabadefaaef19`	pdf-javascript-stream	PDF /JS object 8 at offset 0x1E7	117767 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s).
`javascript_obj0008_001.js` `8ecc782b87fdedeb0c864f29d4d4a1d428f25937fe92375606cae9f4609f4435`	pdf-javascript-stream	PDF /JS object 8 at offset 0x221	117843 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s).

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