PDF malware analysis — malicious · c4cb644a2e410be5

MALICIOUS

PDF

12.6 KB

MD5: 04d50ac9f5aceae5e519b93b182ed0eb SHA-1: eb49757421695db448ca43848ff4f812fe78b52e SHA-256: c4cb644a2e410be53318c5a83f0cc5db24eef35b9d98ef3613961abd7656f14a

146 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.002 Malicious File

The PDF file contains embedded JavaScript, identified by multiple heuristics including 'PDF_JAVASCRIPT' and 'PDF_JS'. The 'PDF_METADATA_EVAL_STAGER' heuristic indicates that this JavaScript is used to decode and execute further code, a common technique for downloading and running second-stage malware. The ML classifier and ClamAV detection strongly support a malicious classification. The embedded JavaScript is the primary mechanism for the attack, likely leading to the execution of a dropped 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` `cc1c245a4ef1b5b8522f9438e2f08ea98aaa839cb5068839c0f95b92c3739e87`	pdf-javascript-stream	PDF /JS object 76 at offset 0x3020	331 bytes

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