Malicious PDF — malware analysis report

Static analysis result for SHA-256 8d54edba2a1b509f…

MALICIOUS

PDF

237.6 KB
MD5: 174621b55077eeccf23e9be6ce0a0bc9 SHA-1: 13898d0a143557b4ace6793cc4695db6cf161cf3 SHA-256: 8d54edba2a1b509f2d84de53741f59e5eb29266b8eee9bc7f0016ea8301ea8d0
92 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 JavaScript, indicating an attempt to obscure malicious content. The presence of PDF_JAVASCRIPT, PDF_JS, and PDF_ENCRYPTED_WITH_JS heuristics strongly suggests that the embedded JavaScript is used to execute malicious code or download further payloads. The ASCIIHexDecode filter also points towards obfuscation techniques commonly used in malware delivery. The document body is heavily garbled, providing no direct clues about the lure.

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.
  • ASCIIHexDecode filter (with exploit indicators) medium PDF_FILTER_HEX
    Hex-encoding filter present alongside exploit delivery indicators — often used to hide payload or shellcode bytes
  • 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

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
javascript_obj0039_000.js
973f24c5f623b8abedb3863edc28dc8291801d15eefd29a14aca3c24bac2edc8		 pdf-javascript-stream PDF /JS object 39 at offset 0x252E 9604 bytes

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