can a pdf image from an email give you malware?

Forgive me for sounding daft here but should I be worried?...

I received an email today about my so-called "rapid test results" today even though I never took a test. Assuming that this was a scam I went to delete it along with a few other emails. As I had the emails selected I noticed that in the preview pane that the PDF attachment's content was visible. I never downloaded clicked to download the PDF (or even open the email) so am hoping I'm ok, but should I get malwarebytes and run a scan? I did just update to the latest Big Sur OS after this happened, but should I do more? Thanks in advance, and again... please forgive my naïveté.