Sorry for the delayed response and inconvenience caused. When you try to open a PDF file and if it stored in Adobe Cloud storage or any other cloud storage location, Acrobat connects to the internet to open the PDF file on your machine.
Please install the latest update of Acrobat 2017 from help>check for updates, reboot the machine after installing the updates and see if this brings any difference.
You can also install the latest patch/update manually from 17.011.30080 Planned update, May 14, 2018 — Release Notes for Acrobat DC Products
If connecting to a different network environment is resolving the issue, then it seems to be a network security restriction issue. I have shared the list of Adobe Ports and URLs via private message, please share the details with your IT team so that they can whitelist them on the network.
Let us know how it goes and share your findings.
Anand, we are facing the same problem. Acrobat works OK without network, but beachballs when the network is active. There's a proxy in the network.
Could you provide the list of servers and ports that Acrobat DC accesses to adjust the proxy?
I have shared the list of Adobe Ports and URLs via private message, please check your email inbox.