Malicious PDF — malware analysis report

Static analysis result for SHA-256 b4b990e65b88ff5e…

MALICIOUS

PDF

335.4 KB
MD5: 470d5b5bb87837639f043f3de4b97525 SHA-1: b7b9f11d5b7bc1dfda813b752b0721cff9d5bb1f SHA-256: b4b990e65b88ff5e484353cfae27ec88bcae5222bc609f34da10945719daca48
184 Risk Score

Malware Insights

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

The PDF file contains embedded JavaScript and a RichMedia (Flash) object, triggering critical heuristics for PDF exploits. The embedded JavaScript stream and the embedded SWF file are the primary indicators of malicious activity. The ClamAV detection 'Pdf.Exploit.Agent-35955' further confirms the malicious nature. The embedded JavaScript is likely responsible for downloading and executing a second-stage payload, as indicated by the PDF_JAVASCRIPT and PDF_JS heuristics.

Heuristics 6

  • ClamAV: Pdf.Exploit.Agent-35955 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Exploit.Agent-35955
  • ClamAV detection on extracted artifact critical EXTRACTED_FILE_CLAMAV
    ClamAV flagged at least one file extracted from inside this sample. Even when the wrapping document carries no AV detection of its own, a hit on the carved artifact is a strong indicator the sample is a delivery vehicle.
  • RichMedia (Flash) high PDF_RICHMEDIA
    PDF contains /RichMedia (Adobe Flash) which is a historic exploit vector
  • 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.
  • Embedded file low PDF_EMBEDDED
    PDF embeds a file attachment — could carry an executable or another weaponised document as a nested payload

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
WpuVlEGnF.swf
bf9dea6ff47dfb47c2f51b1fa9a09527dfe5e95399ccb2d043ba956b197360c9		 pdf-embedded-file PDF EmbeddedFile object 16 at offset 0x4D397 52647 bytes
Detection
ClamAV: Pdf.Exploit.Agent-35955
Obfuscation or payload: unlikely
javascript_obj0006_000.js
adddc6330c1fade3051c55a3e6d184f626d547a717e6ef8569bd3481d61d86ae		 pdf-javascript-stream PDF /JS object 6 at offset 0x13E 6478 bytes

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