Rather than suck the entire file into memory (if it's bigger than the sample you posted), you could process it line-by-line and use the flip-flop operator (see perldoc perlop)
#!/usr/bin/perl
use strict;
use warnings;
use feature 'say';
my $HSSIN = shift or die "usage: $0 <inputfile";
open my $infile, $HSSIN or die "Can't open input file";
my ($MSISDN, $cfu_found, $cfb_found);
while (<$infile>) {
# this is true for all lines between these two markers
if (/^\s*<SUBBEGIN/.. /^<SUBEND/) {
if (/MSISDN=(.+)/){
$MSISDN = $1;
}
if (/^\s*CF=CFU-TS10-ACT/){
$cfu_found = 1;
}
if (/^\s*CF=CFB-TS10-ACT/){
$cfb_found = 1;
}
}
}
if ($cfu_found and $cfb_found){
say "cfu and cfb both found and MSISDN is $MSISDN";
}
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