Malicious PDF — malware analysis report

Static analysis result for SHA-256 b72e331e477a26ef…

MALICIOUS

PDF

199.7 KB
MD5: fa638be33d7f02996d3e6d217d62e89f SHA-1: 5162db0e1f62e53df506e84f84ec0fee3c7dcf33 SHA-256: b72e331e477a26efeee8c6414407e94e5ee58df94289c7da373e8bb6daba67d2
214 Risk Score

Malware Insights

MITRE ATT&CK
T1204.002 Malicious File T1566.001 Spearphishing Attachment

The PDF file contains embedded JavaScript and a Flash object (SWF), both of which are commonly used to exploit vulnerabilities and deliver secondary payloads. ClamAV detected this as 'Pdf.Exploit.Agent-35955', indicating a known exploit. The embedded SWF file and JavaScript stream are the primary indicators of the attack vector. The ML classifier also strongly flagged this as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9806

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 0x2B4B9 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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