PDF malware analysis — malicious · 6a542926e698ca90

MALICIOUS

PDF

389.1 KB

MD5: 9249f48157018d56b01ab4a79dc10e9e SHA-1: fc7e7e2f16148ae0811d172df2da8cacbe164ebf SHA-256: 6a542926e698ca90a8237a4f51e438d7f036f9a35b4bc2e02891058085f5b5d4

186 Risk Score

Malware Insights

MITRE ATT&CK

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

The PDF file contains embedded JavaScript, flagged by multiple heuristics as malicious and identified by ClamAV as Pdf.Exploit.Agent-36175. The JavaScript code appears to be obfuscated but includes a base64 decoding function and attempts to construct a URL from concatenated strings. This script likely downloads and executes a secondary malicious payload, indicating a multi-stage attack. The primary attack pattern is exploitation of a PDF vulnerability to achieve code execution.

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` `766e5912b8649698e067f5620ad6c9954b92354d1b1c9d8c38d937f36ecdcfb7`	pdf-javascript-stream	PDF /JS object 8 at offset 0x1E7	132542 bytes
Detection ClamAV: Pdf.Exploit.Agent-36175 Obfuscation or payload: unlikely

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