AcroCEF.exe/RdrCEF.exe are inseparable processes of Adobe Acrobat and Acrobat Reader. They handle multiple integral aspects of the application, such as network interaction and Document Cloud services (Fill and Sign, Send For Signature, Share for View/Review, and so on).
If these processes do not function properly, an error message is displayed while using any of the services dependent on the processes.
To fix the error, try the following solutions in the order they appear below.
DLL injection refers to the interference or block of the functionality of the AcroCEF or RdrCEF processes by DLLs from third-party software. To fix this issue, add the Acrobat installation directory to the exception list of the third-party software. Once added to the exception list, the AcroCEF or RdrCEF processes work as expected.Note:
The steps below explain how to add exceptions to Avast antivirus software. If you are using different antivirus software, follow the instructions on the respective website, and add the Acrobat or Acrobat Reader folder to the exception list accordingly.
If you are still facing the issue, analyze the ProcMon logs to identify the third-party DLLs loaded in the AcroCEF or RdrCEF processes, and then safelist the Acrobat or Acrobat Reader folder in the corresponding third-party software.
You can sometimes resolve the error by uninstalling and reinstalling Acrobat.