File parsed returns unreadable text

Thank you for the awesome Pdfparser library, it really helps me a lot with my projects, and use it quite often recently..
But I found a difficulty with my last project which was my pdf file was converted into some unreadable format text instead of plain text..
My friend told me I should do something with the encoding, but I'm not really sure..
So, I would really glad if anybody can give me some hint or idea if I missing something or it was indeed a bug from the library..
I've tried to parse it as a whole and by each pages btw, it was still not working..

Here is my code,

$PdfParser = new \Smalot\PdfParser\Parser();
$pdf = $PdfParser->parseFile($file);
$text -> getText();
echo $text;

And this is what it returns,

    
     
           
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st  GUH
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# Z,-.

Reproduce the report with the supplied PHP snippet, the affected PDF, and the parseFile/getText flow. Inspect how this PDF's encoded text is handled and determine whether the output can be returned as readable plain text; the issue is done when the behavior is corrected or the limitation is clearly established.