When PDF files are selected in Windows Explorer, a hook to pdfshell.dll calls on AcroRd32Info.exe to load the selected PDF file, extract the required information, and then pass it back to the shell for display. The shell integration is also what allows for the PDF tab in the file properties. If you like to stop this behavior:
- Click on Start->Run
- Type:
- regsvr32 "C:\Program Files\Common Files\Adobe\Acrobat\ActiveX\pdfshell.dll" /u
- Click Ok