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[Pax-NKUNGA]

The HKLM path is generically: 

HKLM\Software\Adobe\(product name)\(version)\AVGeneral\bValidateBytesBeforeHeader=dword:00000000

For example, to change the behavior for Acrobat 11.0, create a DWORD at this location: HKLM\SOFTWARE\Adobe\Adobe Acrobat\11.0\AVGeneral\bValidateBytesBeforeHeader=dword:00000000

The HKCU path is generically:

HKCU\Software\Adobe\(product name)\(version)\AVGeneral\bValidateBytesBeforeHeader=dword:00000000

For example, to change the behavior for Reader 10.0, create a DWORD at this location: HKCU\SOFTWARE\Adobe\Acrobat Reader\10.0\AVGeneral\bValidateBytesBeforeHeader=dword:00000000

Always change the product and version number in the preference path to match your installation. This method allows the PDF to display on machines you control.

[Nic Brough -Adaptavist-]

Welcome to the Atlassian Community!

Could you explain what this has to do with Confluence?