Malicious PDF — malware analysis report

Static analysis result for SHA-256 406136dfc76b5183…

MALICIOUS

PDF

278.0 KB
MD5: d9cc8fe4f7a076a9f4777bb9714207ef SHA-1: 70a7e6b2d2a40502cdf3e70d87cd5a282de4be89 SHA-256: 406136dfc76b5183a0a559fa8e9653c62a0b9e238c7a8eeb3874885d99154f41
214 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and a Flash object, both of which are commonly used to exploit vulnerabilities. The ClamAV detection 'Pdf.Exploit.Agent-35955' strongly suggests a known PDF exploit. The embedded JavaScript stream, though obfuscated, is indicative of a downloader or exploit execution mechanism. The presence of a SWF file further supports the exploitation vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9772

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 0x3EDB5 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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