Malicious PDF — malware analysis report

Static analysis result for SHA-256 51a4a1c4e92cd9da…

MALICIOUS

PDF

741.8 KB Created: ³ˆÈ:;Ö˜'@€ Ìé¨iÎ Authoring application: p¿{]+^6¡h¬x°âÈ¡4Yžï£@r (via ¶BȗÝlÁqÃd ÙS]ž°¹`Î>èeW–ÃöŒÑV)
MD5: 54d781c3f48160aee96180cc5ac3dedd SHA-1: ad9d66a0e726c85aa83622eccd501f6b0f029502 SHA-256: 51a4a1c4e92cd9da73f3c5d49600e01f9bf1a56f04659756165feae94ab3231a
74 Risk Score

Malware Insights

MITRE ATT&CK
T1059.001 PowerShell

The PDF file contains embedded JavaScript and is encrypted with JavaScript, indicating an attempt to hide malicious content. The presence of PDF_ENCRYPTED_WITH_JS and PDF_JS heuristics strongly suggests that the embedded script is responsible for decrypting or executing the actual payload. The PDF_IMAGE_ONLY_LURE heuristic indicates that the document may be using images to trick the user into interacting with the malicious content, as no text operators were found. The obfuscated nature of the script prevents a more detailed analysis of its specific actions.

Heuristics 6

  • Encrypted PDF carries /JS — payload hidden from static analysis high PDF_ENCRYPTED_WITH_JS
    PDF declares /Encrypt and also references an executable trigger (/JS). 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 file low PDF_EMBEDDED
    PDF embeds a file attachment — could carry an executable or another weaponised document as a nested payload
  • Additional-actions dictionary low PDF_AA
    PDF defines /AA (Additional Actions) that references an executable action (JS/JavaScript/Launch/SubmitForm) — can auto-trigger on document or widget events. Form-field calc/format/validate/keystroke handlers in legitimate interactive forms commonly fire this, so it is reported as a low-weight signal; weaponised auto-execution is flagged by stronger rules (PDF_OPENACTION, encrypted-with-JS, etc.)
  • 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.