Malicious PDF — malware analysis report

Static analysis result for SHA-256 ba8f709fbac3969b…

MALICIOUS

PDF

14.6 KB
MD5: 41f088e7efa9ac91dfde52b4839a0d96 SHA-1: 2d5eab63032cc14cbe04063fe1245725f5f6c4d7 SHA-256: ba8f709fbac3969b2266fd94b22d5098415b36a2fe1b149fa83a9ea274944dcf
148 Risk Score

Malware Insights

MITRE ATT&CK
T1204.002 Malicious File T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF file exhibits characteristics of malicious intent, including an embedded script payload and XFA form usage, as indicated by the 'PDF_EMBEDDED_SCRIPT_PAYLOAD' and 'PDF_XFA' heuristics. ClamAV detections ('Pdf.Exploit.Dropped-78' and 'Pdf.Exploit.Agent-36809') further confirm its malicious nature. The embedded script is likely responsible for downloading and executing a second-stage payload, although its exact function cannot be determined due to obfuscation. The presence of an embedded URL suggests a potential delivery or command-and-control vector.

Heuristics 5

  • ClamAV: Pdf.Exploit.Dropped-78 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Exploit.Dropped-78
  • 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://www.xfa.org/schema/xfa-template/2.5/

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
embedded_pdf_script_00000329.bin
a95f966b9333cc6344973705779b3a1056a7522b3f14c7d5df4f7e0bad4a107d
pdf-embedded-script PDF raw stream script payload at offset 0x329 14239 bytes
Detection
ClamAV: Pdf.Exploit.Agent-36809
Obfuscation or payload: unlikely