Definitely a scam,and some of thes can be dangerous.
I think you are wise to change your password.
Some of these emails are like a cyber chain letter.You open it,it gets into your address books and sends itself to all the addresses in the book.
That's it,stupid,but to your friends annoying.
Most don't do any more than above,BUT it always pays to be carfeul.
If I don't recognise such mails I don't even open them,just put them in the spam folder.
If it WAS really urgent(and genuine) mail,the person/company will mail me again.