Malicious PDF — malware analysis report

Static analysis result for SHA-256 2c11792333b6dafb…

MALICIOUS

PDF

93.5 KB
MD5: ac5e13e11561d1437481ac9d7f3194c9 SHA-1: 78ad5235c04658a82ac136bc8a6f65e9add11491 SHA-256: 2c11792333b6dafbca0556ebef366ae1c60bf773fc847da6cf5ebe3b63921bc4
178 Risk Score

Malware Insights

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

The PDF file contains an embedded script payload, as indicated by the PDF_EMBEDDED_SCRIPT_PAYLOAD heuristic and confirmed by ClamAV detections (Pdf.Exploit.Agent-6136306-0). The ML classifier also strongly flagged this PDF as malicious. The embedded script is likely responsible for exploiting a vulnerability within the PDF reader to download and execute a second-stage payload. The XFA form structure is also noted.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • ClamAV: Pdf.Exploit.Agent-6136306-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Exploit.Agent-6136306-0
  • 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.
  • Embedded script payload in PDF stream medium PDF_EMBEDDED_SCRIPT_PAYLOAD
    PDF stream bytes contain an HTML/XFA <script> tag without accompanying Windows shell-execution primitives — common in accessible XFA forms but worth surfacing for analyst review.
  • XFA form low PDF_XFA
    PDF uses XML Forms Architecture — can contain script logic
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://ns.adobe.com/xdp/
    • http://www.xfa.org/schema/xfa-template/2.5/
    • http://www.xfa.org/schema/xfa-data/1.0/

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
embedded_pdf_script_00000246.bin
aec11b38751791a7eba4312c088d4c5669bcb1bf74d0c521d92be6bbc82d1f59		 pdf-embedded-script PDF raw stream script payload at offset 0x246 95026 bytes
Detection
ClamAV: Pdf.Exploit.Agent-36769
Obfuscation or payload: unlikely

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