/usr/bin/pdfwalker is in origami-pdf 2.0.0-1ubuntu1.
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 | #!/usr/bin/env ruby
$:.unshift "/usr/share/origami"
require 'gui/walker'
PDFWalker::Walker.start(ARGV[0])
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