Malicious PDF — malware analysis report

Static analysis result for SHA-256 95e892b3b2593d64…

MALICIOUS

PDF

461.5 KB Created: Çâ©b'Aê>Ëá?hy]h&iÏ Authoring application: -Q]„¡ö=Bx ûZ¾{*;G<
MD5: b1d0b1d122681b67f6e8273cd105bc6e SHA-1: bcdbe79363ccaee0284c83a4f0e3c4dd386a9e0f SHA-256: 95e892b3b2593d64f41d28cc2f655e6ab86f69e508b2a873f762e0c4fc299863
92 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and is encrypted, with the JavaScript referencing the encryption details. This suggests the JavaScript is used to obfuscate or hide the malicious payload from static analysis. The presence of numerous streams and an AcroForm button with an action trigger further indicates a complex, potentially malicious document structure. The primary attack pattern involves leveraging PDF features to conceal and deliver a malicious payload.

Heuristics 6

  • 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.
  • Unusually high stream count medium PDF_MANY_STREAMS
    PDF contains 501+ stream objects — may indicate heap spray or heavy obfuscation
  • 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.
  • 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.)
  • 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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