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I am using pdfdetach utility which would extract embedded objects in PDF files and dump them to the current folder. Output can be anything such as .doc files or others. All I want to do is that whatever the output of the pdfdetach, I want it to be stored in sub-directory instead of current directory by default.

Here is the simple line I am trying but is not working:

pdfdetach -saveall JSPopupCalendar.pdf > /subfolder/

Use the "-o" argument. e.g. pdfdetach -saveall JSPopupCalendar.pdf -o /subfolder

See man page http://manpages.ubuntu.com/manpages/trusty/man1/pdfdetach.1.html

-saveall

Save all of the embedded files. This uses the file names associated with the
embedded files (as printed by the "-list" switch). By default, the files are saved
in the current directory; this can be changed with the "-o" switch.

-o path

Set the file name used when saving an embedded file with the "-save"
switch, or the
directory used by "-saveall".

Example, showing how we detach the KSBASE.WQ2 file from inside fileAttachment.pdf.

$ pdfdetach -saveall fileAttachment.pdf -o bar
$ find . -ls
 384329 0 drwxrwxr-x 3 steve steve 43 Sep 7 17:42 .
9137752 0 drwxrwxr-x 2 steve steve 24 Sep 7 17:42 ./bar
8544834 24 -rw-rw-r-- 1 steve steve 20668 Sep 7 17:42 ./bar/KSBASE.WQ2
 384331 80 -rw-rw-r-- 1 steve steve 78950 Nov 2 2017 ./fileAttachment.pdf
$