Invalid object reference for $obj.

[noise3]

• PHP Version: 8.0
• PDFParser Version: 2.12.0

Description: With this PDF I get this error: "Invalid object reference for $obj." on line 544 of the file RawDataParser.php

PDF input

gráfico anual collado.pdf

Expected output & actual output

The text of the file

Code

$parser = new \Smalot\PdfParser\Parser();

// Leemos el PDF
try {
$config = new \Smalot\PdfParser\Config();
$config->setIgnoreEncryption(true);
$pdf = $parser->parseFile($pdfGenCu_FicheroTemporalRecibido, $config);

// Sacamos el texto y por si acaso, lo pasamos todo a mayúsculas
$contenidoPDF = $pdf->getText();
$contenidoPDF = strtoupper($contenidoPDF);
// Vamos a quitar los dobles espacios si hubiera
$contenidoPDF = preg_replace('/\s\s+/', ' ', $contenidoPDF);

} catch (Exception $e) {
$alert_text = 'Error al procesar el PDF: ' . $e->getMessage();
if (method_exists($e, 'getLine') && $e->getLine() !== null) {
$alert_text .= ' en la línea ' . $e->getLine();
}
if (method_exists($e, 'getFile') && $e->getFile() !== null) {
$alert_text .= ' en el fichero ' . $e->getFile();
}
}

[N0zoM1z0]

Hello,

I can confirm this bug and I've managed to create a minimal, reproducible test case using fuzzing, which might be easier to debug than a full PDF file.

Test Case:

This small input file consistently triggers the "Invalid object reference for $obj." error.

1. Save the following content to a file named minimized-crash.txt:

echo "JVBERi2oqApzdGFydHhyZWYKMjYKJSVFT0Y="|base64 -d >./minimized-crash.txt

2. Run this PHP script:

<?php
require 'vendor/autoload.php';
$bad_pdf_content = file_get_contents(__DIR__ . '/minimized-crash.txt');
$parser = new \Smalot\PdfParser\Parser();
try {
    $parser->parseContent($bad_pdf_content);
} catch (\Throwable $t) {
    echo "CRASH (Reproduced): " . $t->getMessage() . "\n";
}

This should help pinpoint the issue more quickly. Thanks!

[rupertj]

@N0zoM1z0 Your test data just contains a single reference to an object that doesn't exist. When trying to parse that data, pdfparser throwing the exception saying it can't find the referenced object seems correct to me.

What we need to establish, I think, is if the example PDF that @noise3 uploaded actually contains a reference to an object that doesn't exist, or if the object does in fact exist, and pdfparser isn't finding it for some other reason.