I had an issue with one of my customers trying to download that same quicktime file yesterday. They were unable to receive the full file once downloaded. According to your screenshot there was malware in the file, is that true?
Hi, no Malware in file, downloaded via ISA proxy and installed Ok, running McAfee VirusScan Enterprise 8.7i on desktop which scanned fine.
Could it be the Heuristics level ?
Yes. I was just doing somemore research on it and it looks like it picked it up as a heuristic.behaveslike file.
When a file is being scanned, it unrolls all the archives inside the file.
QuickTimeInstaller.exe has about 2000-3000 files contained within it that must be extracted and scanned, that takes time to be sure.
I just tried this in 6.8.x and it took about the same amount of time.
The Antimalware block you got is clearly a false positive, so in that instance putting it in a whitelist is appropriate.