PDF malware analysis — malicious · 855c3a03e806ad76

MALICIOUS

PDF

12.8 KB

MD5: d2d87f5bf9c47d220366cabc0a8c2ab0 SHA-1: ea3be4bb6ffa5a3160711de0f69dbca807e32dce SHA-256: 855c3a03e806ad76be77a74e61b9dd7ba6cd23ca380a8038a46db4cde05f6a4b

146 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.002 Malicious File

The PDF file was flagged as malicious by ML classification and ClamAV, specifically as 'Pdf.Exploit.Dropped-94'. Static analysis revealed embedded JavaScript within the PDF's metadata and a separate JS stream, indicating an attempt to execute malicious code. The presence of these JavaScript elements strongly suggests the PDF is designed to exploit vulnerabilities or deliver a secondary payload upon opening.

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` `ffa51ca6e67a220954aadf25d485361dd8dc20df115d23e17e15fe78c72aec94`	pdf-javascript-stream	PDF /JS object 76 at offset 0x30E3	331 bytes

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