Malicious PDF — malware analysis report

Static analysis result for SHA-256 bb91e4cc08eb7a34…

MALICIOUS

PDF

547.6 KB Created: Y·L!gèõÞdÍóò¸xúŸ® Ä Authoring application: \î ~M0¬ç¾º§ç)Pñ€¹a%Ã-Ô±& UÄ (via \î ~M0¬çª<¶¯à G£™§>Ök”o5^ÙÁZ)
MD5: 0f0c83b13bffb2e9d8288de875385aba SHA-1: 4f69fb6b77150b504058137d754ad837236922b9 SHA-256: bb91e4cc08eb7a34414ed979dbc802c0e44effe6629b2855390c212d84a0ced2
84 Risk Score

Malware Insights

MITRE ATT&CK
T1059.001 PowerShell T1566.001 Spearphishing Attachment T1027 Obfuscated Files or Information

The PDF file contains embedded JavaScript and is encrypted, with an OpenAction that likely hides the malicious payload from static analysis. The presence of JavaScript actions and an encrypted structure suggests an attempt to obfuscate malicious content, likely for delivery of a secondary payload. The PDF is also presented as an image-only lure, further indicating a deceptive purpose.

Heuristics 5

  • Encrypted PDF carries /OpenAction — payload hidden from static analysis high PDF_ENCRYPTED_WITH_JS
    PDF declares /Encrypt and also references an executable trigger (/OpenAction). 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.
  • PDF paints image(s) but contains no text operators medium 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.
  • 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.
  • 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

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