Sending personalised files to a list of contacts

Hello!

As a result of an interactive installation at an event, I have a set of personalised pdf's associated to a list of contacts/emails.

Now after the event we'd like to send a follow up to each person with a link to download their own pdf.

I can think of two ways to do this:

1. Name each pdf: your-report-{{lead.last name}}.pdf , upload on marketo, and then use the last name token to link to each file

2. Create a custom field that holds the file name of each pdf - send the campaign - then hide the field  (Which I want to avoid - right?)

Is there any other way you can think of?

Thanks,

.yannis