PDF malware analysis — malicious · 118b317f0aef22c8

MALICIOUS

PDF

12.4 KB

MD5: e8668cadfe98a329a694eabdc54d6ded SHA-1: c548032f0fef9a1aeb2619db0453c689c1395c76 SHA-256: 118b317f0aef22c8875d3aaabb91bdf428e4f59c8df51c5a258eaedea4571f1c

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 a 'PDF_METADATA_EVAL_STAGER'. This script decodes a string using a custom character set and then evaluates it, indicating it's designed to download and execute a second-stage payload. The ClamAV detection 'Pdf.Exploit.Dropped-94' further confirms its malicious nature.

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` `dc813e49f150cfdb0e6c852eac29a0178406d812eca862e95cc768a38073f93a`	pdf-javascript-stream	PDF /JS object 76 at offset 0x2F98	331 bytes

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