[SalesForce] Reading a pdf file in apex controller

I hacked a Apex Charset encoder/decoder util, check gist Charset.cls

/**
 * Convenience method that decodes bytes in charset into a string of Unicode
 * characters.
 * <p>
 * @param  input binary characters in charset
 * @param  charset name according to http://www.iana.org/assignments/character-sets/character-sets.xhtml
 * @return string of Unicode characters
 */
public static String decode(final Blob input, final String charset){
    final String hex = EncodingUtil.convertToHex(input);
    final Integer size = hex.length() >> 1;
    final List<String> bytes = new String[size];

    for (Integer i = 0; i < size; ++i) {
        bytes.set(i, hex.mid(i << 1, 2));
    }
    return EncodingUtil.urlDecode('%' + String.join(bytes, '%'), charset);
}

Typically good for file/blob sizes < 200 kB depending on current heap/regexp limits.

Add Charset.cls and change your controller to use Charset.decode with a valid charset name, i.e ISO-8859-1.

global with sharing class FileParser {
    public Blob bFile {get; set;}

    public PageReference processReturnFile() {
        String strFile = Charset.decode(bFile, 'ISO-8859-1');
        System.debug(strFile);
    }
}

You can use any of the PageReference methods. The most straightforward would be:

Blob pdfData = Page.myPageName.getContent();

Note that this technically still counts as a callout (meaning, you cannot use DML before calling it), but is far shorter than any other solution.

If this should be dynamic:

Blob pdfData = new PageReference('/apex/myPageName').getContent();