Document Signing

I've done a similar thing for someone.

Do you receive the Word file from an external source or you have a template for it?
and
In what form is the digital signature? Is it an image file like PNG/JPG?

1.

If it's a template and the digital signature is an image file it would be simple to add bookmarks to where data must be entered and also to the place where the digital signature must go.

This is how I think it would work for you, with a user form and considering your document is a template:

a. You would type "date and particulars" in userform fields and then use a button to insert the data in bookmarks

b. You would have a button to insert the signature in a desired location, then save file as PDF and attach it to new email.

Note:
- the template is not necessarily saved with the data you entered, the Word document could be closed without saving and data would remain only in PDF

2.

If it's NOT a template but the digital signature is an image file then you would have to click in the place where you want the signature, then click a button to insert it and then save as PDF and attach it to new email.

3.

If the digital signature is not an image file or can't be used as one, and it can only be inserted from PDF viewing application, then I don't know how to do it via VBA.