Malicious PDF — malware analysis report

Static analysis result for SHA-256 9bc04bff3068c76b…

MALICIOUS

PDF

45.0 KB
MD5: 72718fdc5bc3edea1f1c84d0bdcf6f07 SHA-1: 8aa67904c5477d492d1378a9d2be4a31b2352e48 SHA-256: 9bc04bff3068c76b9fb8f7ddd015a7edea5fdd91e3a8a04e490dba38fddc4daa
76 Risk Score

Malware Insights

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

The PDF file contains embedded JavaScript, indicated by the PDF_JAVASCRIPT and PDF_JS heuristics. ClamAV detection as 'Pdf.Exploit.Agent-36128' strongly suggests it's malicious. The embedded JavaScript is likely designed to exploit a vulnerability within the PDF reader to execute arbitrary code, potentially downloading and running a second-stage payload. The large size of the embedded JavaScript streams further supports this.

Heuristics 3

  • ClamAV: Pdf.Exploit.Agent-36128 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Exploit.Agent-36128
  • 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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
javascript_obj0008_000.js
fa66dc5e0d906c27b0cf61d2ff4eb8f3578c9012b0587834620308ed463244b5		 pdf-javascript-stream PDF /JS object 8 at offset 0x1E7 45305 bytes
legacy_pdfkit_stage_000.js
a5c7c62f9bcdec43b081b3e198448c5d61affce8b39800355038d37e874ff621		 deobfuscated-js double percent-decoded annotation JavaScript at offset 0x1E7 33047 bytes

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