Possible shellcode mailed to me

When I opened my email this morning I found a rather odd message in my mail box. It didn’t seem like your every day spam email as it looked like a base64 encoded string and nothing else. Here is a screenshot of the email:

I tried running it through decoders, and after decoding it to hexadecimal I ran it through a malware analyzer on this website, and it looks like possible assembly code.

There is also a strange header in the email: X-phsgyov: twxmjuo says, which makes it seem like the email was crafted.

My question is, does anyone have any knowledge of what this is? There is a pastebin link of what I’ve found so far here.