PDF malware analysis — malicious · b6e838dd459e63a8

MALICIOUS

PDF

12.6 KB

MD5: dce5665e1edb7945e94e6055acabbae1 SHA-1: 3718d17ffcdc5ca103fd38744dd7749081607c39 SHA-256: b6e838dd459e63a8f77d79c499871fcfd1c0fdd52a3b67ed90d44f64c615cd5b

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 as a stager and exploit. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded JavaScript is likely responsible for downloading and executing a second-stage payload, as suggested by the 'PDF_METADATA_EVAL_STAGER' heuristic. The specific ClamAV detection name 'Pdf.Exploit.Dropped-94' further supports this. No specific family could be identified.

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` `a5c6c3ce3aaf9c1f7ed4711b1c7e1def9e2532ad08c0322281fc58a73d1f536d`	pdf-javascript-stream	PDF /JS object 76 at offset 0x3034	331 bytes

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