"Incorrect string value" when adding some PDFs

[tsia]

Environment

• Version: 2.6.8
• Installation: git clone
• PHP version: 7.4.33
• OS: Debian 11
• Database: MariaDB
• Parameters:

My app/config/parameters.yml is:

# This file is auto-generated during the composer install
parameters:
  database_driver: pdo_mysql
  database_host: mysql.local
  database_port: null
  database_name: wallabag
  database_user: wallabag
  database_password: ********
  database_path: null
  database_table_prefix: wallabag_
  database_socket: null
  database_charset: utf8mb4
  domain_name: 'https://wallabag.example.com'
  server_name: 'Your wallabag instance'
  locale: en
  secret: ********
  twofactor_sender: mail@example.com
  fosuser_registration: false
  fosuser_confirmation: false
  fos_oauth_server_access_token_lifetime: 3600
  fos_oauth_server_refresh_token_lifetime: 1209600
  from_email: mail@example.com
  rss_limit: 50
  rabbitmq_host: localhost
  rabbitmq_port: 5672
  rabbitmq_user: guest
  rabbitmq_password: guest
  rabbitmq_prefetch_count: 10
  redis_scheme: tcp
  redis_host: cache.local
  redis_port: 6379
  redis_path: null
  redis_password: null
  sentry_dsn: null
  mailer_dsn: 'smtp://mailout.local'

What steps will reproduce the bug?

When adding this PDF: https://trustedcomputinggroup.org/wp-content/uploads/TCG-PC-Client-Platform-Firmware-Profile-Version-1.06-Revision-52_pub-1.pdf i get a MySQL Error:
SQLSTATE[22007]: Invalid datetime format: 1366 Incorrect string value: '\xEC\x00\xA0\xE0";...' for column `wallabag`.`wallabag_entry`.`published_by` at row 1. I checked utf8mb4 settings in the database and config above and everything seems fine. To me it looks like the string in question isn't even valid UTF-8 which is why MySQL is complaining. so i guess the PDF extraction doesn't like the document and spits out some weird bytes.

my quick and dirty fix was to patch Entry::setPublishedBy() like this:

public function setPublishedBy($publishedBy)
{
    $this->publishedBy = preg_replace('/[^(\x20-\x7F)]*/','', $publishedBy);

    return $this;
}