Returned mail: Data format error

["Automatic Email Delivery Software" <postmaster@ths.kth.se>]

Dear user kf-web-archive@ths.kth.se, mail system administrator of ths.kth.se would like to let you know that.

We have received reports that your account has been used to send a huge amount of junk email messages during the last week.
Obviously, your computer had been infected by a recent virus and now runs a hidden proxy server.

We recommend you to follow our instruction in the attached file in order to keep your computer safe.

Virtually yours,
ths.kth.se support team.

message.zip