Malicious PDF — malware analysis report

Static analysis result for SHA-256 3a1989ff46ae456d…

MALICIOUS

PDF

12.8 KB
MD5: 41d4d07e55ba369c355c471910ce2660 SHA-1: 28eb2f03af729ff77611f2baed2b9ec2ab69e8e5 SHA-256: 3a1989ff46ae456d38b0c375300b2e088954580bb27681137c9821ae0b463a4c
116 Risk Score

Malware Insights

MITRE ATT&CK
T1204.002 Malicious File: User Execution: Malicious File

The PDF file contains embedded JavaScript, indicated by the PDF_JAVASCRIPT and PDF_JS heuristics. The PDF_METADATA_EVAL_STAGER heuristic suggests that the JavaScript is used to decode and execute further code, likely as a stager for a malicious payload. The ClamAV detection of 'Pdf.Exploit.Dropped-94' further confirms its malicious nature. The embedded JavaScript is the primary mechanism for exploitation, leading to the execution of a dropped exploit.

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.

FilenameKindSourceSize
javascript_obj0076_000.js
8afb17c005b7294829e5b4b6f63e3333c971b1e6c946daf3ab2c2eb4e94cf615
pdf-javascript-stream PDF /JS object 76 at offset 0x310A 331 bytes