You include Archive::Tar in your code and your @cdr_list array is meant to be populated with a list of (gzipped) tars, but your dump of the variable doesn't match your command since none of those files is a tar. So, assuming the mention of tar is an artifact and you really just need to deal with zipped files:

use IO::Zlib;
my $fh = new IO::Zlib;
$fh->open('zipfile.gz','rb');
while(<$fh>) {
  print 
}
$fh->close
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If/when you decide to deal with gzipped tars, Archive::Tar can open gzipped files automatically without needing to explicitly unzip them.

chomp @cdr_list;
foreach my $tarzip (@cdr_list) {
  my $tar = Archive::Tar->new($tarzip);
  foreach my $file ($tar->list_files) {
    print $tar->get_content($file)
  }
}
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