Malicious PDF — malware analysis report

Static analysis result for SHA-256 4dbd30f3711117a4…

MALICIOUS

PDF

24.1 KB Created: dôp¼ü ³[¿± oÓw儕z8©{ Authoring application: aF´/î¥N¢/êéE4’f聕 (via aA©"éä{ááâP/À~þž‹{)
MD5: c9bffd57b7a082224d060a677a8d4742 SHA-1: 6af0fd473fe85b77d256bbe540cc84afd248af42 SHA-256: 4dbd30f3711117a44a9767202cd4c5934ee01ecf4e7994bd2b208c5645578665
146 Risk Score

Malware Insights

MITRE ATT&CK
T1059.001 PowerShell T1566.002 Spearphishing Attachment

The PDF file is flagged as malicious by ClamAV and a machine learning classifier. It contains embedded JavaScript which is used to hide the malicious payload and potentially execute further actions. The document body text, though partially garbled, contains references to purchasing software and includes URLs that are likely part of a social engineering lure. The embedded JavaScript is likely responsible for executing the malicious payload, possibly by downloading additional malware or exploiting vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • ClamAV: Pdf.Dropper.Agent-7596639-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Dropper.Agent-7596639-0
  • Encrypted PDF carries /JavaScript — payload hidden from static analysis high PDF_ENCRYPTED_WITH_JS
    PDF declares /Encrypt and also references an executable trigger (/JavaScript). Document encryption hides the JavaScript body and stream contents from static scanners — combined with auto-execution indicators this is a known evasion pattern used to deliver weaponised JavaScript that the analyst cannot inspect without the decryption key.
  • JavaScript action low 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.
  • 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 http://www.regsoft.net/purchase.php3?productid=36654
    • http://www.regsoft.net/purchase_nonsecure.php3?productid=36654

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
javascript_obj0021_000.js
2dbdba7282704c1a56a90d45d3fed39067dee9e092d667f5847fd1567842532b		 pdf-javascript-stream PDF /JS object 21 at offset 0x17A3 130 bytes

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