Malicious PDF — malware analysis report

Static analysis result for SHA-256 943c23dacdec0dd8…

MALICIOUS

PDF

29.8 KB
MD5: 0026368cc8277f2235b5f5117ac2520d SHA-1: 8644f8bfafc152e4636a3e68f86916e7feced097 SHA-256: 943c23dacdec0dd8fd17d64a2be114423cad6cb14bdd95da93fbc299414bea83
186 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, identified by ClamAV as Pdf.Exploit.Agent-35955. The embedded JavaScript stream, 'javascript_obj0006_000.js', likely facilitates the execution of the embedded Flash file 'PpRjAnGpJ.swf'. This combination suggests an exploit chain designed to deliver a secondary payload.

Heuristics 7

  • 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
  • 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
embedded_file_obj0016.bin
c2b666a3ef4c191b77b78c037656e50477b8ba3d35fd61ae843a3a1f4d41c5c1		 pdf-embedded-file PDF EmbeddedFile object 16 at offset 0xD27 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
c00c29fecc5a12e2ba6d0e9ca64d2f3bbdb93b3161e8212e92b1f38a376581c3		 pdf-javascript-stream PDF /JS object 6 at offset 0xEC 2322 bytes

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