How to convert return string from webservice to pdf file

I need to convert string which i am getting from webservice to pdf. Basically webservice is to download file, but i want to use it like download and save file to my database from backend.

Concern is sample pdf file returns is in string format like below

"%PDF-1.3\r\n%\xE2\xE3\xCF\xD3\r\n\r\n1 0 obj\r\n<<\r\n/Type /Catalog\r\n/Outlines 2 0 R\r\n/Pages 3 0 R\r\n>>\r\nendobj\r\n\r\n2 0 obj\r\n<<\r\n/Type /Outlines\r\n/Count 0\r\n>>\r\nendobj\r\n\r\n3 0 obj\r\n<<\r\n/Type /Pages\r\n/Count 2\r\n/Kids [ 4 0 R 6 0 R ] \r\n>>\r\nendobj\r\n\r\n4 0 obj\r\n<<\r\n/Type /Page\r\n/Parent 3 0 R\r\n/Resources <<\r\n/Font <<\r\n/F1 9 0 R \r\n>>\r\n/ProcSet 8 0 R\r\n>>\r\n/MediaBox [0 0 612.0000 792.0000]\r\n/Contents 5 0 R\r\n>>\r\nendobj\r\n\r\n5 0 obj\r\n<< /Length 1074 >>\r\nstream\r\n2 J\r\nBT\r\n0 0 0 rg\r\n/F1 0027 Tf\r\n57.3750 722.2800 Td\r\n( A Simple PDF File ) Tj\r\nET\r\nBT\r\n/F1 0010 Tf\r\n69.2500 688.6080 Td\r\n( This is a small demonstration .pdf file - ) Tj\r\nET\r\nBT\r\n/F1 0010 Tf\r\n69.2500 664.7040 Td\r\n( just for use in the Virtual Mechanics tutorials. More text. And more ) Tj\r\nET\r\nBT\r\n/F1 0010 Tf\r\n69.2500 652.7520 Td\r\n( text. And more text. And more text. And more text. ) Tj\r\nET\r\nBT\r\n/F1 0010 Tf\r\n69.2500 628.8480 Td\r\n( And more text. And more text. And more text. And more text. And more ) Tj\r\nET\r\nBT\r\n/F1 0010 Tf\r\n69.2500 616.8960 Td\r\n( text. And more text. Boring, zzzzz. And more text. And more text. And ) Tj\r\nET\r\nBT\r\n/F1 0010 Tf\r\n69.2500 604.9440 Td\r\n( more text. And more text. And more text. And more text. And more text. ) Tj\r\nET\r\nBT\r\n/F1 0010 Tf\r\n69.2500 592.9920 Td\r\n( And more text. And more text. ) Tj\r\nET\r\nBT\r\n/F1 0010 Tf\r\n69.2500 569.0880 Td\r\n( And more text. And more text. And more text. And more text. And more ) Tj\r\nET\r\nBT\r\n/F1 0010 Tf\r\n69.2500 557.1360 Td\r\n( text. And more text. And more text. Even more. Continued on page 2 ...) Tj\r\nET\r\nendstream\r\nendobj\r\n\r\n6 0 obj\r\n<<\r\n/Type /Page\r\n/Parent 3 0 R\r\n/Resources <<\r\n/Font <<\r\n/F1 9 0 R \r\n>>\r\n/ProcSet 8 0 R\r\n>>\r\n/MediaBox [0 0 612.0000 792.0000]\r\n/Contents 7 0 R\r\n>>\r\nendobj\r\n\r\n7 0 obj\r\n<< /Length 676 >>\r\nstream\r\n2 J\r\nBT\r\n0 0 0 rg\r\n/F1 0027 Tf\r\n57.3750 722.2800 Td\r\n( Simple PDF File 2 ) Tj\r\nET\r\nBT\r\n/F1 0010 Tf\r\n69.2500 688.6080 Td\r\n( ...continued from page 1. Yet more text. And more text. And more text. ) Tj\r\nET\r\nBT\r\n/F1 0010 Tf\r\n69.2500 676.6560 Td\r\n( And more text. And more text. And more text. And more text. And more ) Tj\r\nET\r\nBT\r\n/F1 0010 Tf\r\n69.2500 664.7040 Td\r\n( text. Oh, how boring typing this stuff. But not as boring as watching ) Tj\r\nET\r\nBT\r\n/F1 0010 Tf\r\n69.2500 652.7520 Td\r\n( paint dry. And more text. And more text. And more text. And more text. ) Tj\r\nET\r\nBT\r\n/F1 0010 Tf\r\n69.2500 640.8000 Td\r\n( Boring.  More, a little more text. The end, and just as well. ) Tj\r\nET\r\nendstream\r\nendobj\r\n\r\n8 0 obj\r\n[/PDF /Text]\r\nendobj\r\n\r\n9 0 obj\r\n<<\r\n/Type /Font\r\n/Subtype /Type1\r\n/Name /F1\r\n/BaseFont /Helvetica\r\n/Encoding /WinAnsiEncoding\r\n>>\r\nendobj\r\n\r\n10 0 obj\r\n<<\r\n/Creator (Rave \\(http://www.nevrona.com/rave\\))\r\n/Producer (Nevrona Designs)\r\n/CreationDate (D:20060301072826)\r\n>>\r\nendobj ... 

Please suggest.