The following is general view for the Labels

This is how it looks like

How to connect to AIP module

Connect-AadrmService

This is how you classify the PDF

PowerShell for Azure Portal Admin tasks

Install the module

Import-Module AzureInformationProtection

Gets the Azure Information Protection label and protection information for a specified file or files.

https://docs.microsoft.com/en-us/powershell/module/azureinformationprotection/get-aipfilestatus?view=azureipps

The following command to view the file status

Get-aipfilestatus

The following is how you get the label ID

Set-AIPFileLabel(you will need the label ID)

Sets or removes an Azure Information Protection label for a file, and sets the protection according to the label configuration.

The following is the permissions for labels