Malicious PDF — malware analysis report

Static analysis result for SHA-256 e950409c8fb71b47…

MALICIOUS

PDF

42.3 KB
MD5: 1dfd096d38a0c45ebec86776b5ce29bf SHA-1: 13000d948b3a625f1a6a97bf22c9ca89aee2e073 SHA-256: e950409c8fb71b474143ac7e7b9005d15a52b640bf7911c8bc49702c9b5b0b00
186 Risk Score

Malware Insights

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

The PDF file contains embedded script content, flagged by multiple heuristics as malicious. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded script is likely responsible for exploiting a PDF viewer vulnerability to execute a payload, as suggested by the 'PDF_EMBEDDED_SCRIPT_PAYLOAD' and 'CLAMAV_DETECTION' firings. The embedded artifact 'embedded_file_obj0008.bin' is the likely payload.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 6

  • ClamAV: Pdf.Exploit.Agent-36830 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Exploit.Agent-36830
  • 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.
  • Embedded file low PDF_EMBEDDED
    PDF embeds a file attachment — could carry an executable or another weaponised document as a nested payload
  • 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_file_obj0008.bin
cb79b221ab88304b534410ac0db5948723b5bec986d8d5968652a939c3f57b5d		 pdf-embedded-file PDF EmbeddedFile object 8 at offset 0xC6 42561 bytes
Detection
ClamAV: Pdf.Exploit.Agent-36830
Obfuscation or payload: unlikely

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