PDF malware analysis — malicious · c1987fe7cd066238

MALICIOUS

PDF

12.9 KB

MD5: 05b9d4709ad8e9ff95ead501b6215de2 SHA-1: 4d463835ac42edf27dc75b8940760fae3044e841 SHA-256: c1987fe7cd066238962f51da62621d53beefea3769bd9f5c5bfdd6310654992d

146 Risk Score

Malware Insights

MITRE ATT&CK

T1204.002 Malicious File: Malicious File

The PDF contains embedded JavaScript, identified by heuristics as a potential stager. This JavaScript is likely responsible for executing an exploit within the PDF viewer, as indicated by the 'PDF_METADATA_EVAL_STAGER' and 'ML_NYX_PDF_MALICIOUS' firings. The ClamAV detection 'Pdf.Exploit.Dropped-94' further confirms its malicious nature. The primary function appears to be exploiting the PDF viewer 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` `e774e2f16684decd578481ecc1bd9d4cfa75b181b0f2e9753fcbcaa807ff9289`	pdf-javascript-stream	PDF /JS object 76 at offset 0x316A	331 bytes

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