How to write a string in an image or PDF?

Question

Having a template image or a PDF file with an image template embedded in it, the image could be a card for example, hence in the application have fields TextBox as "Name, CPF and Comment", hence defining locations in the image or document to write these strings from TextBox, thus filling the card with the content informed

Example:

In the application the guy writes:

Name: Jóse da Rabina

CPF: 12345678901

Commentary: This is a comment

And in PDF or Image appear:

I searched on the subject and found almost nothing, of code I only have the textBox really, if someone gives me a tip on how to do or something like that I’d appreciate it.