At times anti virus programs have "false positive" issues.
The thing here is to be SURE of your download source.
The Hughes Download Status Meter from here:
From that link posted and from the picture posted yes.
It is just your AV being cautious and making you THINK, DOUBLE CHECK things and do just what you are doing ! .. question & investigate.
Sgoshe .. we need to qualify that a little:
In Win7, Win Defender is a "malware scanner", In Win8/8.1 it takes on other aspects.