Strange illlegible emails?

Every few days I get a new email with a long subject line of nothing but random symbols in my junk box on Hotmail. It happened first the day I registered my email address, so it’s nothing that I signed up for. I understand there’s spam and viruses, but don’t those only work if they look like something I would want to open? It’s literally just a bunch of:

”#koe#1osla9p8u35089mjacv8vn[ai8#$()l3)034”

I should have saved a few to show an actual example. I don’t remember the addresses they’ve been from. It’s just very odd.