PDF malware analysis — malicious · 0c898499577bf615

MALICIOUS

PDF

388.4 KB

MD5: d2849f5bf4454ff4b21d0612c3d31862 SHA-1: 4b92431f4a1762bf042bf422dcaf14c049b5d4fc SHA-256: 0c898499577bf6156265b10184046e0f651af7ae28f8348887472e65c52ab3f4

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-like decoding function. The script's primary purpose is to decode a heavily obfuscated string, which likely represents a second-stage payload. The ClamAV detection 'Pdf.Exploit.Agent-36175' and ML classifier further indicate malicious exploitation. The decoded string is included as an IOC due to its potential to be a URL or executable payload.

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` `841d1b6125437002fb1cdcf54ff6e3c617d0a7475517841b7a4ef8c0e03e7a5f`	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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