PDF malware analysis — malicious · 655797e71fe55a2e

MALICIOUS

PDF

12.4 KB

MD5: 4c095f0791fd69586b5ae6c7bfac1211 SHA-1: a445996152468aadceaa5270cdf6936af8d0ec26 SHA-256: 655797e71fe55a2ec4fca569ce1dc1aaa3f9d11ffe6a350719714d8670cf4c0a

146 Risk Score

Malware Insights

MITRE ATT&CK

T1059.007 JavaScript T1203 Exploitation for Client Execution T1566.001 Spearphishing Attachment

The PDF file contains embedded JavaScript that is obfuscated but appears to be designed to decode and execute a payload. The script uses string concatenation and eval to construct and run code, likely leading to the download and execution of a second-stage malware. The critical ClamAV detection and high-confidence ML classifier further support the malicious nature of this PDF.

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` `a841acedbd30b4006ffcdb797319b418f640fd36e36f46b1ed184b4f51a87d5b`	pdf-javascript-stream	PDF /JS object 76 at offset 0x2F6C	331 bytes

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