PDF malware analysis — malicious · 5abfc7bd13b15748

MALICIOUS

PDF

388.4 KB

MD5: 6e0ad97fdfc819074bc87c2a56ff02b8 SHA-1: 4ce0dc04768a0ca816b40d61fa563f20450187b9 SHA-256: 5abfc7bd13b15748b768f9ca0b42453583ef7a62b8f1caf3cff1e15194aa8632

186 Risk Score

Malware Insights

MITRE ATT&CK

T1059.007 JavaScript T1203 Exploitation for Client Execution T1566.001 Spearphishing Attachment

The PDF sample contains embedded JavaScript that is obfuscated using string concatenation and a custom Base64 decoding function. The JavaScript is designed to decode a payload, which is then likely executed. This is supported by multiple PDF-specific heuristics and a critical ClamAV detection for 'Pdf.Exploit.Agent-36175', indicating a known exploit. The primary attack pattern involves exploiting a client vulnerability via a malicious attachment.

Machine Learning

Nyx PDF Classifier malicious score 0.9999

Heuristics 5

ClamAV: Pdf.Exploit.Agent-36175 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Exploit.Agent-36175
ClamAV detection on extracted artifact critical EXTRACTED_FILE_CLAMAV

ClamAV flagged at least one file extracted from inside this sample. Even when the wrapping document carries no AV detection of its own, a hit on the carved artifact is a strong indicator the sample is a delivery vehicle.
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.

Extracted artifacts 1

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj0008_000.js` `9ff4112508074d7d13bdab62b391e4ae5f54a577b1f430bfcd0cb38fa338aa25`	pdf-javascript-stream	PDF /JS object 8 at offset 0x1E7	132308 bytes
Detection ClamAV: Pdf.Exploit.Agent-36175 Obfuscation or payload: unlikely

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