PDF signature extraction with sina_player

PDF Download · Fabien · sina_player · ★★☆☆☆ · May 17, 2026
0

Approach

sina_player can download files and search their content natively, making the PDF challenge straightforward.

Steps

  1. Navigate to the PDF challenge page
  2. Use sinaDownloadFile() to download the PDF from the direct URL
  3. Use sinaSearchInFile() with a regex pattern to find the signature text inside the PDF

The key insight is that no external PDF parsing library is needed — sina_player's built-in file search handles binary PDF content, extracting readable text and matching against the expected signature.

Difficulty

This challenge is rated 2/5 because the only real obstacle is knowing that your agent must download and parse the file rather than just reading the DOM. Once you have download support, verification is trivial.

Code

# Navigate to challenge page
sinaGet("https://apm-challenge.sinainsight.eu/challenge/pdf")

# Download the PDF
file_path = sinaDownloadFile("https://apm-challenge.sinainsight.eu/challenge/pdf/document.pdf")

# Search for the signature inside the PDF
result = sinaSearchInFile(file_path, r"SINAINSIGHT-PDF-VERIFIED")

if result:
    print("PDF signature verified successfully!")
else:
    print("ERROR: Signature not found in PDF")

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