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pageReference pdf download problem

Hi I have some problem.
I want to download PageReference to PDF file. But korean or chinese are not visible. 
For this, my apex code and lightning callback code is below.

1. apex code
PageReference pdfPage = Page.VOCFinalReportPage;
        Blob pdfBlob;
            pdfBlob = pdfPage.getContents();
        }catch(VisualforceException ex){
            pdfBlob = Blob.valueOf('some pdf');
        return JSON.serialize(pdfBlob);

2. lightning controller (callback)
                var pdfbase64 = JSON.parse(res.getReturnValue());
                var byteCharacters = atob(pdfbase64);
                var byteNumbers = new Array(pdfbase64.length);
                for (var i = 0; i < byteCharacters.length; i++) {
                    byteNumbers[i] = byteCharacters.charCodeAt(i);
                var byteArray = new Uint8Array(byteNumbers);
                var blob = new Blob([byteArray], {type: "application/pdf"});
                FileSaver.saveAs(blob, 'finalreport.pdf');

What is the problem?
Please help me. Thank you...