yah its definately injurious , firstly, it depends on the type of file attached with it ,u never now the file attched with the mail is trust worthy or not,its not neccesary that ur system will gonna tell u,hey its a malicious file,likewise.
seconly,many times it is feasible,that it contains some malicious forms and along with it this type of message is displayed "
ur account going to be expire in 2 days,if u'll want to save it than fill the forms and enjoy "
one cant easily traced tht its a true message or false
so epitome of the story is "injurious"