use field value to populate email subject line

Greetings -

I have a PDF Form in which a button is being used to execute a menu item that submits the completed form to email. By default, the PDF form name is inserted into the email subject line. While this is working fine, the end-user of the form is now asking if data from a specific field can be used to populate the email subject line instead of using the PDF form name.

At a minimum, I'd like to eliminate the form name from being used as the subject line. Ideally, use a specific field value as the email subject line.

Can either of these be done?

Any help you could provide would be greatly appreciated!

Thank you.