Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c5a8533452a6ab5…

MALICIOUS

PDF

154.4 KB
MD5: c015096b985a5a051c037ed576ff1374 SHA-1: dc5ced2f693074686fcdbe87ad567364d8e2c931 SHA-256: 8c5a8533452a6ab5ff8bd0da331f4937591c4f10313d905700ae9306fea3ab43
206 Risk Score

Malware Insights

MITRE ATT&CK
T1204.002 Malicious File

The PDF file contains embedded JavaScript and RichMedia (Flash) content, indicated by PDF_JAVASCRIPT, PDF_JS, and PDF_RICHMEDIA heuristics. ClamAV detection as 'Pdf.Exploit.Agent-35955' confirms its malicious nature. An embedded SWF file, 'WpuVlEGnF.swf', was also extracted, suggesting it's part of the exploit chain. The attack likely leverages a vulnerability to execute this Flash content, leading to a secondary payload or compromise.

Heuristics 8

  • 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
  • ASCIIHexDecode filter (with exploit indicators) medium PDF_FILTER_HEX
    Hex-encoding filter present alongside exploit delivery indicators — often used to hide payload or shellcode bytes
  • 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
  • Suspicious extracted artifact info EXTRACTED_FILE_STATIC_TRIAGE
    One or more files extracted from inside this sample matched static suspicious-content checks such as script obfuscation, encoded payload blobs, packed data, or execution/download terms.

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
WpuVlEGnF.swf
c2b666a3ef4c191b77b78c037656e50477b8ba3d35fd61ae843a3a1f4d41c5c1		 pdf-embedded-file PDF EmbeddedFile object 16 at offset 0x1EFA8 26774 bytes
Detection
ClamAV: Pdf.Exploit.Agent-35955
Obfuscation or payload: likely
Carved artifact entropy is 7.99, consistent with packed or encrypted content.
javascript_obj0006_000.js
333042fc77621860f9b16228cd1bd11ec0f99d0fa6930f548cbf65181a57aac5		 pdf-javascript-stream PDF /JS object 6 at offset 0x13E 6441 bytes

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