Sorry to hear about the trouble.
There was an outage reported for the Document Cloud pdf services and an intermittent issue was going on with the website. The issue has now been rectified and the services are seems to be up and running fine.
The issue causing impact has been resolved and the affected services are currently operating normally. So you may check it back and see if you are able to access it now of not.
For further troubleshooting, you can check with a different web browser or an alternate internet connection.
Hope this helps.