If you need to get a list of AD users in “Dynamic Distribution Groups” then you can use this PowerShell script… here. Only problem is that the script does not export details of Dynamic Distribution Group.

You can list DDG users by running this script using the Exchange Management Shell (EMC)

$Group = Get-DynamicDistributionGroup -Identity "Staff-UK"
Get-Recipient -Filter $Group.RecipientFilter -OrganizationalUnit “domain.com/UK_Users_OU/Branch_Users” | Out-File c:\Staff-UK.txt