This file is indexed.

/usr/bin/pdfrevert is in libtext-pdf-perl 0.29a-3.

This file is owned by root:root, with mode 0o755.

The actual contents of the file can be viewed below.

 1
 2
 3
 4
 5
 6
 7
 8
 9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
#!/usr/bin/perl

=head1 NAME

pdfrevert.plx - Removes one layer of edits from a PDF file

=head1 DESCRIPTION

Removes one layer of changes to a PDF file, trying to maximise the
    size of the output file (to account for linearised PDF).

=head1 SYNOPSIS

    PDFREVERT infile

=cut

use Text::PDF::File;

unless (defined $ARGV[0])
{
    die <<'EOT';
    PDFREVERT infile
    
Removes one layer of changes to a PDF file, trying to maximise the size of the
output file (to account for linearised PDF).
EOT
}

$cr = '\s*(?:\r|\n|(?:\r\n))';
$VERSION = "1.000";         # MJPH   6-NOV-1998     Original

$f = Text::PDF::File->open($ARGV[0], 1);
exit unless defined $f->{'Prev'};

# account for linearised pdf, maximise output
for ($t = $f; defined $t->{' prev'}; $t = $t->{' prev'})
{
    $loc1 = $t->{'Prev'}->val;
    $loc = $loc1 if ($loc1 > $loc);
}

$fd = $f->{' INFILE'};
seek($fd, $loc, 0);
$rest = "";
while ($len = read($fd, $dat, 1024))
{
    $len += length($rest);
    $_ = $rest . $dat;
    if (m/(?:\r|\n|(?:\r\n))%%EOF$cr/oi)
    {
        $loc += length($` . $&);
        last;
    }
    elsif (m/$cr(.*?)$/oi)
    {
        $rest = $1;
        $loc += $len - length($rest);
    }
}

if ($len != 0)
{
    truncate($fd, $loc) || die "Can't truncate";
}