PDF malware analysis — malicious · 11ab8504d897fcba

MALICIOUS

PDF

12.3 KB

MD5: 668202ca4da9c421d75ffc5285b627af SHA-1: a6fee7c97906f7a728ad1a0e9278b9b76a5b2b02 SHA-256: 11ab8504d897fcba6913c4ef5e513d030d5f297cc05aca7e48da7958c6a59216

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 decode and execute a second-stage payload. The heuristic 'PDF_METADATA_EVAL_STAGER' and the ClamAV detection 'Pdf.Exploit.Dropped-94' strongly indicate exploitation. The JavaScript attempts to evaluate a string, likely containing malicious code, which is then executed.

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` `7390ba217a03192e9431415ece59759b956a0647b330ea8cd7b08b06480a42eb`	pdf-javascript-stream	PDF /JS object 76 at offset 0x2F1F	331 bytes

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