PDF malware analysis — malicious · 9cbc422dd5f68660

MALICIOUS

PDF

12.8 KB

MD5: 97ca012a3fd973ef4caa64f543f09cc0 SHA-1: 9d205534d74e65b45adc92f8083c2e268e5f4c88 SHA-256: 9cbc422dd5f68660dde2584a06c8f6281b7937a7f7569cd2baccbdf13bf25cdf

146 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.002 Malicious File

The PDF contains embedded JavaScript, flagged by multiple heuristics as malicious and specifically identified as a 'PDF metadata JavaScript eval stager'. This suggests the script is designed to decode and execute exploit code, a common technique for dropping secondary payloads. ClamAV detection further confirms its malicious nature. The ML classifier's high score reinforces the assessment.

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` `d504f40f166197f22e8113b653171aee57ee38e6e8f4b86205ce4c4a1da2afc5`	pdf-javascript-stream	PDF /JS object 76 at offset 0x30EA	331 bytes

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