Malicious PDF — malware analysis report

Static analysis result for SHA-256 b3df538ee03c9580…

MALICIOUS

PDF

100.5 KB
MD5: a3930f39a9e581c754f080bb624d41b8 SHA-1: 7f7d10ba43e7a17e0080f9c7a77152b030c4ef82 SHA-256: b3df538ee03c958044e55b6be2bea0fbd38ada15e20d940b481009b61f743b7c
178 Risk Score

Malware Insights

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

The PDF file utilizes XFA forms and contains an embedded script payload, as indicated by multiple high and critical heuristic firings, including ClamAV detections. The ML classifier also strongly flagged this PDF as malicious. While the embedded script itself was not directly analyzed for its specific actions, the presence of an embedded script payload within an XFA-based PDF strongly suggests it is designed to download and execute a second-stage payload.

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
5408beb9eaee55102a5d9d2b0c5a7b4492c1be90b05f85af7b906f3a7c25b7ee		 pdf-embedded-script PDF raw stream script payload at offset 0x246 102154 bytes
Detection
ClamAV: Pdf.Exploit.Agent-36769
Obfuscation or payload: unlikely

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