PDF malware analysis — malicious · 6c79c1ceb267423c

MALICIOUS

PDF

13.2 KB

MD5: e2c492a1e1d12456e1ac93d686de4f90 SHA-1: 67b54776e71e4a50d6c6a4665bb026ac05876dd4 SHA-256: 6c79c1ceb267423cbafb83a333746295427e6531ffa6a1815844dbd34ea1d7d4

146 Risk Score

Malware Insights

MITRE ATT&CK

T1059.007 JavaScript T1566.001 Spearphishing Attachment

The PDF file contains embedded JavaScript, identified by multiple heuristics including 'PDF_JAVASCRIPT' and 'PDF_JS'. The JavaScript code appears to decode and execute a payload, as indicated by the 'PDF_METADATA_EVAL_STAGER' heuristic and the ML classifier's high confidence. The ClamAV detection name 'Pdf.Exploit.Dropped-94' further confirms its malicious nature. The script's logic suggests it downloads and executes a second-stage payload, likely delivered as a spearphishing attachment.

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` `4f15e6705bc300150922829c74cc1b8378c8623d3d4fc9d3d015ca182a38299d`	pdf-javascript-stream	PDF /JS object 76 at offset 0x32C9	331 bytes

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