I downloaded the mentioned file, and using clamAV (Linux), I also get a virus warning, so yes. Normal:

free@beer~$ clamscan virus-caused-multiple-weird-reports.msg 
virus-caused-multiple-weird-reports.msg: Worm.Mytob.LC FOUND

----------- SCAN SUMMARY -----------
Known viruses: 4289294
Engine version: 0.98.7
Scanned directories: 0
Scanned files: 1
Infected files: 1
Data scanned: 0.05 MB
Data read: 0.07 MB (ratio 0.72:1)
Time: 7.149 sec (0 m 7 s)
[download]

And although it is false alarm: Thanks for taking the time to post it. Stay alert.