PDF malware analysis — malicious · 5171c21f3e2815c2

MALICIOUS

PDF

12.8 KB

MD5: f163f8c0d44f1835e840471ca8a87403 SHA-1: 0917ea994b2d3f5b03acd139e929cde4c34e75d4 SHA-256: 5171c21f3e2815c2b1b73a9b647fdb1fc528721f6b96c559c77eb44b5fb8af94

146 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.002 Malicious File

This PDF file was flagged as malicious by a machine learning classifier and ClamAV, which identified it as 'Pdf.Exploit.Dropped-94'. Heuristics indicate the presence of embedded JavaScript within the PDF's metadata and a separate JS stream, suggesting an exploit stager. The primary function appears to be the execution of this JavaScript, which is likely designed to download and execute a secondary 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` `36c1b9dff233cc78d30e02679f5b82332ba883f1dac2d3aa540c8d683bbf3edc`	pdf-javascript-stream	PDF /JS object 76 at offset 0x3105	331 bytes

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