Information
PDF files can contain URLs that initiate connections to websites in order to share or get information. Any Internet access introduces a security risk as malicious websites can transfer harmful content or silently gather data.
Solution
Configure the following registry value:
Registry Hive:
HKEY_LOCAL_MACHINE
Registry Path:
\Software\Policies\Adobe\Adobe Acrobat\2015\FeatureLockDown\cDefaultLaunchURLPerms\
Value Name: iURLPerms
Type: REG_DWORD
Value: 1
The setting may be set to '0' if a documented risk acceptance approving the websites is approved by the ISSO/AO.
Configure the policy value for Computer Configuration > Administrative Templates > Adobe Acrobat Pro DC Classic > Preferences > Trust Manager > 'Access to websites' to 'Enabled' and select 'Block PDF files access to all web sites' in the drop down box. Select 'Custom setting' if needed and provide a documented risk acceptance approved by the ISSO/AO approving the websites.
This policy setting requires the installation of the AcrobatProDCClassic custom templates included with the STIG package. 'AcrobatProDCClassic.admx' and 'AcrobatProDCClassic.adml' must be copied to the \Windows\PolicyDefinitions and \Windows\PolicyDefinitions\en-US directories respectively.