Malicious PDF — malware analysis report

Static analysis result for SHA-256 ddb7faa1b04a7c14…

MALICIOUS

PDF

18.3 KB
MD5: 41999289f9ed2f90de585ee71a6b18c7 SHA-1: f2c5c3f9324c7c99778c6cbc220eede7677af550 SHA-256: ddb7faa1b04a7c146cae63c8b69d6f74488433e02b6a60b71934ff851860a7a6
148 Risk Score

Malware Insights

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

The PDF file exhibits multiple critical heuristic firings, including ClamAV detections for 'Pdf.Exploit.Agent-36789' and 'Pdf.Exploit.Agent-36809', indicating a known malicious signature. The presence of an XFA form and an embedded script payload further supports its malicious nature. The embedded script is likely responsible for downloading and executing a second-stage payload, as suggested by the 'PDF_EMBEDDED_SCRIPT_PAYLOAD' heuristic. The embedded URL, while seemingly benign, is part of the exploit chain.

Heuristics 5

  • ClamAV: Pdf.Exploit.Agent-36789 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Exploit.Agent-36789
  • 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.x&#102;a.org/schema/xfa-template/2.5/

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
embedded_pdf_script_00000325.bin
192c135007cae1fd0b2d996fc943305fabc3eeaf744535b4d90d4116a3541168
pdf-embedded-script PDF raw stream script payload at offset 0x325 17978 bytes
Detection
ClamAV: Pdf.Exploit.Agent-36809
Obfuscation or payload: unlikely