Malicious PDF — malware analysis report

Static analysis result for SHA-256 c9a48bc989edeb5b…

MALICIOUS

PDF

435.0 KB Created: Îý—D¤Mö0Q±Orówî%t¼¨d\ Authoring application: ˤ×öQâR%Æ;!®'ª(woª¸2C_ÏÅG (via ˤ×öQâFó)©.½zoyµ©zKDK_ÉÙGü)
MD5: b0143864b05826aacf541b131df93a74 SHA-1: 5dfa47700ab5727dc71f2ca5820d976487ed2a0a SHA-256: c9a48bc989edeb5b41c878d7f3d0a1eee1b6c362d87225ed4814fab45aac90e3
104 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by an ML classifier and contains embedded JavaScript, which is used to obscure its content. The presence of JavaScript actions and encrypted content suggests an attempt to hide a malicious payload from static analysis. While several URLs are present, they are all confirmed as benign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8020

Heuristics 7

  • 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.
  • XFA form low PDF_XFA
    PDF uses XML Forms Architecture — can contain script logic
  • AcroForm button with action trigger low PDF_ACROFORM_BUTTON
    PDF contains a /Btn form field together with a SubmitForm/URI/Launch/JS trigger — this is the building block of fake 'Download' or 'Open' button overlays used in PDF phishing lures
  • PDF paints image(s) but contains no text operators info PDF_IMAGE_ONLY_LURE
    PDF has 2 image XObject(s) and the content stream contains no text-emitting operators (BT/ET, Tj, TJ, ', ") in either raw bytes or decompressed streams — this is the screenshot-as-PDF pattern used to bypass text-based scanners and to deliver instructions purely through rendered pixels. It is informational unless paired with invisible links or risky URI context.
  • 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.w3.org/1999/02/22-rdf-syntax-ns#
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/pdfx/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://purl.org/dc/elements/1.1/

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