PDF rendering for complex script in mediawiki environment is erratic. Malayalam WikiSource, and Wikibooks currently use Collection extension and has the default link on the portlet as PDF. Since PDF is buggy, please modify the configuration to display ODT as default for Malayalam wiki projects on the portlet instead of PDF.
Please see similar bugs 37384 , 37154 also
Version: unspecified
Severity: normal
See Also:
https://bugzilla.wikimedia.org/show_bug.cgi?id=37154
https://bugzilla.wikimedia.org/show_bug.cgi?id=37384