Malicious PDF — malware analysis report

Static analysis result for SHA-256 280b3d5826f9cc6b…

MALICIOUS

PDF

2.5 KB Created: 2008-31-20 53:85:00 Authoring application: aaaaaaaa
MD5: bf0c3e41e6e3d6f27a15ae85c7459f4b SHA-1: 7af640be8b9d64c0acbfdeb9f9eff9e8da2e6d28 SHA-256: 280b3d5826f9cc6bef69185f754a093de32b4f7d73329ef46b1090ba2f513e9e
108 Risk Score

Malware Insights

MITRE ATT&CK
T1059.001 PowerShell T1204.002 Malicious File

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as Pdf.Exploit.Agent-36014. Static analysis revealed embedded JavaScript, indicating an attempt to exploit PDF vulnerabilities. The embedded JavaScript file, 'javascript_obj0013_001.js', is likely responsible for downloading and executing a secondary payload, which is a common technique for initial access.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • ClamAV: Pdf.Exploit.Agent-36014 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Exploit.Agent-36014
  • 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.
  • Suspicious extracted artifact info EXTRACTED_FILE_STATIC_TRIAGE
    One or more files extracted from inside this sample matched static suspicious-content checks such as script obfuscation, encoded payload blobs, packed data, or execution/download terms.

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
javascript_obj0013_001.js
4041dc123ea0c473c19809a7f724c0b0972c57660d9380270f660e1c1f102900
pdf-javascript-stream PDF /JS object 13 at offset 0x328 3675 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 6 eval/decoder/string-building token(s).