PDF malware analysis — malicious · 28b57833f8551558

MALICIOUS

PDF

12.7 KB

MD5: 21c7a1a60f8151397719af93b69cf163 SHA-1: 3cbe93ba8b435a2648c2071fdcc2115b2ff07e35 SHA-256: 28b57833f8551558350fd248996a56c3e2b7bcc4dafe01ee149d3b82eacfc54e

148 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.002 Malicious File

The PDF file was flagged as malicious by ML classifiers and ClamAV with the signature Pdf.Exploit.Dropped-94. High-severity heuristics indicate the presence of JavaScript within the PDF's metadata and embedded streams, which is commonly used to stage exploits. The embedded JavaScript is likely responsible for executing the malicious 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` `000d783dc36ce263504b81c355a5c2c507d38812812116328feeb6183c2adeea`	pdf-javascript-stream	PDF /JS object 76 at offset 0x3087	331 bytes

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