Hi ​@michuk 

I’d recommend using Nintex Workflow (Formerly Nintex Automation Cloud) for this instead of Nintex Workflow For O365.  Two main reasons for this:

1. Nintex Workflow makes this a very simple process by using the Copy or move file action: https://help.nintex.com/en-US/nwc/Content/Designer/Actions/SharePointOnline-CopyaFile.htm
2. Nintex Workflow for O365 is deprecated so you’d end up looking to move to Nintex Workflow anyway.  You can do this in the O365 product but it’s multiple web service calls which is much harder to work with. 

Sorry I used the wrong tag. I am using Nintex 2016.

How can I move this to the right area? Nintex 2016 for sharepoint

Hi ​@michuk,

Can you provide some examples of the naming convention to give us an idea of where the ID is, how long it is, etc.? Then, we may be able to help with a workflow that creates a folder based on the ID and then moves the PDF into it.
Did you want a workflow that moves all existing files or one that runs on new files? The difference is that if you want to move all existing files the workflow would need to query the list first.