CoreSyncCustomHook.exe is a third party (Adobe?) DLL that is part of the Microsoft application compiler. Any application can include the file. If your copy is digitally signed by Adobe and has a valid signature, then most likely it was not infected by malware. Nefarious websites could introduce malware infected copies of CoreSyncCustomHook.exe but I think this unlikely if it is digitally signed by Adobe and has a valid signature.
Check out this link: What is this exe file? Is this file safe? Check here I think you might be able to D/L a trial of this Emsisoft Anti-Malware app to test your system
Well, maybe McAfee has a problem.
I use Malwarebytes Pro and Defender and they see no problem after a scan (before McAfee removed the files).
I am not really using CC for images, so lets see what happen over time.
Lightroom and Photoshop works fine.
Personally, I gave up on McAfee a number of years ago when someone or something blew through it one night after I had left Skype on (by mistake).
They had control of my system and wanted to sell me a fix. Nothing I had or could find would get rid of it.
I had to scrub the system, reformat, and reload everything.
Today I got the following message from McAfee: CoreSyncCustomHook.exe infected by Artemis!A104317B615B (Trojan Horse). I could not install the update for Adobe Creative Cloud. Adobe-Errorcode 183
McAfee VirusScan Enterprise 8.8 Patch 10 V 5900.7806 DAT-version 8771.0000 11.01.2018
I do not know if the file has a virus, or the virus scanner reports false alarm.