Download and open pdf from phishing emails

Yesterday I received a phishing email, stating that I had made a transaction, but I never did.

When I opened the email, the PDF file had already been downloaded, and I opened it, but I didn't see it saved in "My Files." It says to call a number if you don't feel like making the transaction, but I didn't click on the link or number.

I just opened the file.

Is that okay? Or should I reset to factory settings?

I'm really panicking..

Thank you