Thank you for great solution, it is working fine for me to show the rupees symbol in invoice PDF in magento.
Solution Steps :
1.Download the font that support Indian Rupee symbol. recommended dejavu-sans font.
http://dejavu-fonts.org/wiki/Download
https://sourceforge.net/projects/dejavu/files/dejavu/2.36/dejavu-sans-ttf-2.36.zip/download
2.Place the font in lib directory(projectname/lib).
3.open app/code/core/Mage/Sales/Model/Order/Pdf/Abstract.php and app/code/core/Mage/Sales/Model/Order/Pdf/Items/Abstract.php
- copy paste both files under local
a) app/code/local/Mage/Sales/Model/Order/Pdf/Abstract.php
b) app/code/loacl/Mage/Sales/Model/Order/Pdf/Items/Abstract.php
and replace
$font = Zend_Pdf_Font::fontWithPath(Mage::getBaseDir() . '/lib/LinLibertineFont/LinLibertine_Re-4.4.1.ttf');
with
$font = Zend_Pdf_Font::fontWithPath(Mage::getBaseDir() . '/lib/dejavu-sans/DejaVuSans.ttf');
(in _setFontRegular(), _setFontBold(), _setFontItalic() functions in both files.)
- Admin -> System --> Manage Currency -->Symbols --> Copy your symbol like in my case "₹" and save.