Malicious PDF — malware analysis report

Static analysis result for SHA-256 85f5c8f6370d7283…

MALICIOUS

PDF

18.3 KB
MD5: 8c07ed730d7d2db66ca16dff6a4437da SHA-1: aa08a730a761098f11bc9504c534a5adc99f8504 SHA-256: 85f5c8f6370d728329d3d87caacf90cea00bd65044bfaf41881f7a3258426871
148 Risk Score

Malware Insights

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

The PDF file contains an embedded script payload, indicated by the PDF_EMBEDDED_SCRIPT_PAYLOAD heuristic. ClamAV detections (Pdf.Exploit.Dropped-78 and Pdf.Exploit.Agent-36809) confirm its malicious nature. The XFA form suggests a potential for complex scripting or exploit delivery. The embedded URL is likely part of the exploit chain.

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
a65c479a3c2053b7e19d3bb5a7b70a4d53da2b8cf808471f21948c2112568825
pdf-embedded-script PDF raw stream script payload at offset 0x329 18035 bytes
Detection
ClamAV: Pdf.Exploit.Agent-36809
Obfuscation or payload: unlikely