PDF malware analysis — malicious · 11b1f908c333d974

MALICIOUS

PDF

12.8 KB

MD5: 460e5ab08b3e5351ddd2012b0509ed4e SHA-1: d32f29b86070173a65799fc8b9a4561175425283 SHA-256: 11b1f908c333d97428b8917b5876365106a7a8fb5691b5709a8fd0af25c03756

146 Risk Score

Malware Insights

MITRE ATT&CK

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

The PDF file contains embedded JavaScript, identified by multiple heuristics including 'PDF_JAVASCRIPT' and 'PDF_JS'. The JavaScript code appears to be obfuscated but uses `eval` to execute decoded content, a common technique for stagers. The 'PDF_METADATA_EVAL_STAGER' heuristic specifically points to this pattern. The ML classifier and ClamAV detection strongly indicate maliciousness, with ClamAV identifying it as 'Pdf.Exploit.Dropped-94', suggesting it's a dropper for further exploits.

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` `ca938b31faa0fe562cf26a6c16e01bd0cad0c6b3e9b1c2b1f6d6d4d54c03c1ef`	pdf-javascript-stream	PDF /JS object 76 at offset 0x3142	331 bytes

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