Copy/Paste Text from PDF to a design template in Photoshop without Pixelation

This should be a really simple project for a Photoshop guru. I want to create my wedding invitations using my own handwriting. I have pdf files of the content and a Photoshop template to paste the pdf images (of black and white text) into it. Two files are the completed English versions (RSVP, Info card) which will be used as templates. The English text needs to be replaced with the black/white text in the scanned pdf). I'm not great enough to figure out why this crazy pixelation occurs when I copy and paste pdf to psd and I'm done trying to figure it out! (Attached file of black/white pdf text to move and the finished English file.) No need to speak French, I can send a sketch of what French text replaces the English text.