PDF malware analysis — malicious · 38f935e687dc08f0

MALICIOUS

PDF

12.7 KB

MD5: 24d261e678c64fbb137566a821f990a4 SHA-1: 6b726c453432fe94bc0763229cfc0a28d8957750 SHA-256: 38f935e687dc08f0830ff59926db1458e29faf4fa900ee245a1c3fbfa67c49a0

148 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.002 Malicious File

The PDF contains embedded JavaScript within its metadata, identified by the 'PDF_METADATA_EVAL_STAGER' heuristic. This JavaScript is likely used as a stager to download and execute a secondary payload, as indicated by the 'ML_NYX_PDF_MALICIOUS' and 'CLAMAV_DETECTION' firings. The specific ClamAV detection name 'Pdf.Exploit.Dropped-94' further supports this. No document body text was available for analysis, but the presence of the JavaScript stager is sufficient to infer a malicious intent.

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` `207a59e556fc031f589317951d50fb689fe0d5b85a0d6c407a05e89973caf8e3`	pdf-javascript-stream	PDF /JS object 76 at offset 0x308A	331 bytes

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