Malicious PDF — malware analysis report

Static analysis result for SHA-256 1aabd413a33b4508…

MALICIOUS

PDF

45.0 KB
MD5: cb644196dd4dcd33cc02cb981bca85ca SHA-1: 5a75a7fc18ae561ac6be3d1fdf918f8c00ad400e SHA-256: 1aabd413a33b4508e91af2da6fe57bc4e8116b7399abd5e1cc8cc07ad7aba3e4
76 Risk Score

Malware Insights

MITRE ATT&CK
T1059.001 Command and Scripting Interpreter: PowerShell

The file is a PDF containing embedded JavaScript, indicated by the PDF_JAVASCRIPT and PDF_JS heuristics. ClamAV detection as Pdf.Exploit.Agent-36128 further confirms its malicious nature. The embedded JavaScript is likely responsible for exploiting a PDF vulnerability to download and execute a secondary payload, a common technique for initial access.

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
7555f145473dcdccc1e46e769f82c52aa957b9e0bb7f495e3bdf2438b2374a7d		 pdf-javascript-stream PDF /JS object 8 at offset 0x1E7 45305 bytes
legacy_pdfkit_stage_000.js
16ac24251c8e27affab6dca7d0501333a5f46b85bad44071b9b4466750baa7a4		 deobfuscated-js double percent-decoded annotation JavaScript at offset 0x1E7 33047 bytes

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