Question re: Macro Virus behaviour

["Kelly Robinson" <caliana1989 () gmail com>]

An MS Word file on your computer has a size of 356 KB and a *modified* date
of 19 June 2007 3:37:51 PM. Moreover, the file has been certified clean (i.e.,
uninfected) at this point by an infallible AV scanner.

After a highly-publicised virus outbreak, you examine this file's properties
again and notice it is still 356 KB with the same *modified* date and time.
Can you safely conclude it has not been infected without checking it with
your AV scanner?

Why or why not?

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