PDF malware analysis — malicious · 6166e0ed81d6bc06

MALICIOUS

PDF

11.9 KB

MD5: 229529f4da53cab7052df16eb908e656 SHA-1: 33347ea42f64f75fe3e723ab8db9961a324619b5 SHA-256: 6166e0ed81d6bc064012753b9f6367b6b8fb3aa4a98b9faaadd653d963748584

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 script decodes a string and then uses 'eval' to execute it, which is a common stager technique. The critical ClamAV detection 'Pdf.Exploit.Dropped-94' indicates the file is a known malicious dropper. The embedded JavaScript likely downloads and executes a second-stage payload, making this a typical phishing 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` `ae4714a00581d25ce197f4902f4dd18fc07b94486e0e8bcd0942afb4f9ecf92f`	pdf-javascript-stream	PDF /JS object 76 at offset 0x2D9B	331 bytes

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