malware – Can HTML spam file be malicious?

I was checking mum’s email for her on my Mac when I noticed an email from her “sister” with a HTML file.(mumsname.HTML) I scanned with Norton and opened in my browse. I quickly realised the email address it sent from was not my mum’s sister (no idea how they got the same name) I’ve deleted the file and scanned with Norton but I’m still scared there may be smth hidden in my Mac Here is a link to the file.