PDF malware analysis — malicious · 3613627500b8d952

MALICIOUS

PDF

12.3 KB

MD5: cb9a8d1c8dbe6f74838c3b6219ecefc1 SHA-1: 4713e68f1199d1913c9d62c4676b7fb2158166ca SHA-256: 3613627500b8d9521d3fb81fcd996617489f5a96bf52718211891501cc151116

146 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.002 Malicious File

The PDF file contains embedded JavaScript, flagged by multiple heuristics including a PDF metadata JavaScript eval stager. ClamAV detection as 'Pdf.Exploit.Dropped-94' strongly indicates malicious intent. The embedded JavaScript is likely responsible for downloading and executing a secondary payload, a common technique for PDF-based malware delivery. The ML classifier's high score further supports the malicious classification.

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` `9f6f985eb3d7cb5a2c160640fbc92c529920379ffe6ded289d1e8ea13c734469`	pdf-javascript-stream	PDF /JS object 76 at offset 0x2F1E	331 bytes

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