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zlib-flate -uncompress < IN_FILE > OUT_FILE

I tried this and it worked for me.

zlib-flate can be found in package qpdf (in Debian Squeeze and Fedora 23, according to comments in other answers)

(Thanks to user @tino who provided this as a comment below the OpenSSL answer. Made into propper answer for easy access.)

zlib-flate -uncompress < IN_FILE > OUT_FILE

I tried this and it worked for me.

zlib-flate can be found in package qpdf (in Debian Squeeze, Fedora 23, and brew on MacOS according to comments in other answers)

(Thanks to user @tino who provided this as a comment below the OpenSSL answer. Made into propper answer for easy access.)

zlib-flate -uncompress < FILE

I tried this and it worked for me.

zlib-flate can be found in package qpdf (in Debian Squeeze and Fedora 23, according to comments in other answers)

(Thanks to user @tino who provided this as a comment below the OpenSSL answer. Made into propper answer for easy access.)

zlib-flate -uncompress < IN_FILE > OUT_FILE

I tried this and it worked for me.

zlib-flate can be found in package qpdf (in Debian Squeeze and Fedora 23, according to comments in other answers)

(Thanks to user @tino who provided this as a comment below the OpenSSL answer. Made into propper answer for easy access.)

User @tino commented below the OpenSSL answer but I think this should be separate:

zlib-flate -uncompress < FILE

I tried this and it worked for me.

zlib-flate can be found in package qpdf (in Debian Squeeze and Fedora 23, according to comments in other answers)

zlib-flate -uncompress < FILE

I tried this and it worked for me.

zlib-flate can be found in package qpdf (in Debian Squeeze and Fedora 23, according to comments in other answers)

(Thanks to user @tino who provided this as a comment below the OpenSSL answer. Made into propper answer for easy access.)