Scareware PDF

I received an email this morning with a PDF attachment. I didn't know the sender but the subject line gave the password and the title of PDF was my nickname : XXXXXX[pw to my Mac] and this made it scary. I normally delete mails like those without opening but with the info given, I had to see what was in it. Here's the msg:

Hello, I do know your passwords (check this email subject for one of the passwords), I do know about your daily life, I do know about your internet activities. You do not know anything about me, and you must be wondering why be wondering why you are getting this email, right? I installed a malware on the adult (porn) website and guess what, you visited this website to have fun (you know what I mean!). While you were watching the porn, your web browser started functioning as an RDP+keylogger, which gave me access to your display screen and camera. Right after that, my software collected all of your contacts from your Facebook account, Messenger account, and email account. I created a double screen video. The first part shows the video you were watching (you have a nice taste lol), and the second part shows the recording of your camera (it is you!).

They also asked for $1,000 in Bitcoin.

Since I don't (and haven't) visited a porn site, I figured it was scareware. So, I immediately went to disc utilities and erased my HD and restored the macOS...all of my email, desktop and documents folders are backed up in iCloud and I have DropBox for everything else.

I hope I have done it correctly. Any advice would be appreciated.