PDF malware analysis — malicious · 5db23ae9388295ae

MALICIOUS

PDF

12.4 KB

MD5: c1566cd4f7a7396a9c18f10d77c5e545 SHA-1: 7958de38219ae3df168c61aea6c7b48096f8e93c SHA-256: 5db23ae9388295ae70cac7759d8f393b14f986eb73521b740ffa75237eb82a66

146 Risk Score

Malware Insights

MITRE ATT&CK

T1059.007 JavaScript T1566.001 Spearphishing Attachment

The PDF file contains embedded JavaScript that is obfuscated but appears to be designed to download and execute a second-stage payload. The JavaScript uses a loop and string concatenation to build a command that is then evaluated. The ClamAV detection name 'Pdf.Exploit.Dropped-94' further supports the malicious nature of the file.

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` `8c6e58f82c8d32b1c0f660510dc9384b1efa76cf19b2fe76e76bdc5f702585a9`	pdf-javascript-stream	PDF /JS object 76 at offset 0x2F65	331 bytes

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