Hello,

You need to create 3 different things, in this order:

1- Using Studio, you need to create a new Report (pdf) for you app and customize it to your liking

2- You need to create an email template for the Email you want to send and add the Report you created as an attachment.

3- You need to add an automation that triggers once you archive a record and send the previously created email template that included the Report as an attachment. 

If you need more detailed help, there are very good Odoo videos on youtube concerning all 3 bullet points above