SQL & PL/SQL :: Sending Email With PDF Attachments With Size More Than 32K?

I have been working on sending an email with a pdf attachment.I succeeded in PDF attachments with size <32 K.The steps I Used :

1.created a directory 'EMAIL' that points to the directory containing my pdf file.

2.

declare
vInHandle utl_file.file_type;
flen number;
bsize number;
ex boolean;
l_Output raw(32767);
fname varchar2(30) := 'labels.pdf';
vSender varchar2(30) := some1@hct.edu.om';

[code].....

It send the email <32 k.But for >32 K it give me the error :

ORA-06502: PL/SQL: numeric or value error: raw variable length too long
ORA-06512: at "SYS.UTL_ENCODE", line 243
ORA-06512: at "SYS.UTL_MAIL", line 118
ORA-06512: at "SYS.UTL_MAIL", line 324
ORA-06512: at "SYS.UTL_MAIL", line 414
ORA-06512: at line 18

I know it has something to do with blob or clob ....where i can modify my code to work.