PDF malware analysis — malicious · 4c5802b31b65621a

MALICIOUS

PDF

12.4 KB

MD5: 0fcdb1cb1051a61a77611ea63f2f85e7 SHA-1: e277311198f45fb0dad65ccca5b863b341008b5d SHA-256: 4c5802b31b65621ae1c99ebbcf09ecf2a9a209239e35530f19d3db1d01ea7004

146 Risk Score

Malware Insights

MITRE ATT&CK

T1204.002 Malicious File: Malicious File

This PDF file was flagged as malicious by multiple heuristics, including a critical ClamAV detection for 'Pdf.Exploit.Dropped-94'. The presence of embedded JavaScript, specifically a 'PDF_METADATA_EVAL_STAGER', indicates that the script is likely used to decode and execute an exploit. The ML classifier also strongly supports a malicious verdict. The primary attack pattern involves leveraging PDF vulnerabilities through JavaScript to deliver a secondary payload.

Machine Learning

Nyx PDF Classifier malicious score 1.0000

Heuristics 4

ClamAV: Pdf.Exploit.Dropped-94 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Exploit.Dropped-94
PDF metadata JavaScript eval stager high PDF_METADATA_EVAL_STAGER

PDF JavaScript reads document metadata fields such as title, subject, or producer, decodes character data with parseInt/String.fromCharCode style helpers, and evals the recovered stage. This is a high-signal exploit-kit staging pattern.
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_obj0076_000.js` `5d0b9e4f8968130e17cbd4026c4b5c9aba04f0f33dcdb5229bda95373ee2e5b6`	pdf-javascript-stream	PDF /JS object 76 at offset 0x2F9B	331 bytes

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