CGPDFStringGetBytePtr returning incorrect string while scanning pdf

I have one PDF and I am trying to scan PDF using CGPDFScanner. While scanning the pdf, when the word "file" is encountered, the CGPDFStringGetBytePtr API returns "\x02le". PDF is having Type1 font and no ToUnicodeMapping(CMap). Encoding dictionary is not present in the PDF hence using NSUTF8String encoding. However I have tried with all NSMacOSRomanStringEncoding, NSASCIIStringEncoding but had no luck. What can be the problem?

Thanks.