Posting this for personal reference:
SharePoint 2010 - Configuring Adobe PDF iFilter 9 for 64-bit platforms
Windows Registry Editor Version 5.00
[HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Office Server\14.0\Search\Setup\ContentIndexCommon\Filters\Extension\.pdf]
@=hex(7):7b,00,45,00,38,00,39,00,37,00,38,00,44,00,41,00,36,00,2d,00,30,00,34,\
00,37,00,46,00,2d,00,34,00,45,00,33,00,44,00,2d,00,39,00,43,00,37,00,38,00,\
2d,00,43,00,44,00,42,00,45,00,34,00,36,00,30,00,34,00,31,00,36,00,30,00,33,\
00,7d,00,00,00,00,00
[HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Office Server\14.0\Search\Setup\Filters\.pdf]
"Extension"="pdf"
"FileTypeBucket"=dword:00000001
"MimeTypes"="application/pdf"
sps2010pdf.reg