Here we are not trying to hack or remove password from PDF document we do not currently have access. We will simply disable a password feature for a document we own and have a password to. First install qpdf:
UBUNTU/DEBIAN:
# apt-get install qpdf
FEDORA/CENTOS/REDHAT:
# yum install qpdf

Once qpdf tool is installed run a following linux command to remove a password from input.pdf PDF document and store it as output.pdf
$ qpdf --password='MYPASS' --decrypt input.pdf output.pdf
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