// New method to release all PDF resources
private static void closePdfResources() {
    try {
        StaticLayoutContainers.closeContrastRatioConsumer();
    } catch (Exception e) {
        LOGGER.log(Level.WARNING, "Unable to close contrast ratio consumer: " + e.getMessage());
    }
    
    PDDocument document = StaticResources.getDocument();
    if (document != null) {
        try {
            document.close();
        } catch (Exception e) {
            LOGGER.log(Level.WARNING, "Unable to close PDF document: " + e.getMessage());
        }
    }
}

// Updated processFile method with try-finally cleanup
public static void processFile(String inputPdfName, Config config) throws IOException {
    try {
        preprocessing(inputPdfName, config);
        calculateDocumentInfo();
        Set<Integer> pagesToProcess = getValidPageNumbers(config);
        List<List<IObject>> contents;
        
        if (StaticLayoutContainers.isUseStructTree()) {
            contents = TaggedDocumentProcessor.processDocument(inputPdfName, config, pagesToProcess);
        } else if (config.isHybridEnabled()) {
            contents = HybridDocumentProcessor.processDocument(inputPdfName, config, pagesToProcess);
        } else {
            contents = processDocument(inputPdfName, config, pagesToProcess);
        }
        
        if (config.needsStructuredProcessing()) {
            sortContents(contents, config);
        }
        
        ContentSanitizer contentSanitizer = new ContentSanitizer(
            config.getFilterConfig().getFilterRules(),
            config.getFilterConfig().isFilterSensitiveData()
        );
        contentSanitizer.sanitizeContents(contents);
        generateOutputs(inputPdfName, contents, config);
    } finally {
        // Critical: Ensure resources are closed even if an exception occurs
        closePdfResources();
    }
}