Off the top of my head:
Get swfdump from SWFTOOLS (GPL)
# Windows syntax
my $size = `swfdump -X -Y "$qfn"`
or die "...";
my ($x, $y) = $size =~ /^-X (\d+) -Y (\d+)$/
or die "...";
I strongly recommend a solution that doesn't use an external program.
By the way, it's not called PERL. It's not called FLASH either.
Update: Added missing "= $size". Tested. Added recommendation.
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