PDF malware analysis — malicious · 4f1afc52449eada0

MALICIOUS

PDF

12.7 KB

MD5: aa02c89aa82d9708fcdd86e6e92e0d6d SHA-1: 51fac688de03e0ed117b19aeb72ad3c1130f7ee4 SHA-256: 4f1afc52449eada0c1069d9f9b61281767ec94a77949eedf09b8c656ba2c1116

146 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.002 Malicious File

The PDF contains embedded JavaScript, identified by multiple heuristics including 'PDF_JAVASCRIPT' and 'PDF_JS'. The 'PDF_METADATA_EVAL_STAGER' heuristic indicates that the JavaScript is used to decode and execute further code, a common technique for delivering exploits. The ML classifier and ClamAV detection strongly support its malicious nature, with ClamAV specifically identifying it as 'Pdf.Exploit.Dropped-94'. The embedded JavaScript likely downloads and executes a second-stage 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` `59e2daa0e1bc607d2790506e9851ac076cd0cfa0e1a7d56fce7378933d1289b1`	pdf-javascript-stream	PDF /JS object 76 at offset 0x30B3	331 bytes

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