Malicious PDF — malware analysis report

Static analysis result for SHA-256 fb54c8bbb76583f8…

MALICIOUS

PDF

2.7 KB Created: 5140-01-01 Authoring application: 5638
MD5: 90de2a8fc79cf00377afcc831a132413 SHA-1: 6b3d87dcb60bcf62bb4a6ce30f397bf39d53943f SHA-256: fb54c8bbb76583f8ad3170c925ed0b49a473477a471629ceb1042f75f3b0afa6
96 Risk Score

Malware Insights

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

The PDF file contains embedded JavaScript, indicated by multiple heuristic firings including 'PDF_JAVASCRIPT' and 'PDF_JS'. The 'EXTRACTED_FILE_STATIC_TRIAGE' heuristic flags 'javascript_obj0013_001.js' as suspicious due to obfuscation. ClamAV also detected this file as 'Pdf.Exploit.Agent-36014'. The embedded JavaScript is likely responsible for executing the exploit, leading to the malicious verdict. The exact nature of the exploit is not detailed, but the presence of JavaScript and the ClamAV signature suggest an attempt to leverage PDF vulnerabilities.

Heuristics 4

  • ClamAV: Pdf.Exploit.Agent-36014 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Exploit.Agent-36014
  • Suspicious extracted artifact medium 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.
  • 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_obj0013_001.js
de103f4df01213dea047c5ed799e4799b4f1936061c607dc499d4ea435234ed2
pdf-javascript-stream PDF /JS object 13 at offset 0x328 4780 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 10 eval/decoder/string-building token(s). Carved artifact contains 3 long hex-escaped blob(s).