Malicious PDF — malware analysis report

Static analysis result for SHA-256 2a76382781569425…

MALICIOUS

PDF

535.7 KB
MD5: 36c2a4af1385baeaf1d80615fe8ea719 SHA-1: 67e12b63e3bf8e5e6bce9030298af62c472eaada SHA-256: 2a76382781569425a789d44e7f2e88758bfe9c01ade8a12b7442047d3a13380d
122 Risk Score

Malware Insights

MITRE ATT&CK
T1059.001 PowerShell T1566.002 Spearphishing Attachment T1071.001 Web Protocols

This PDF file was flagged as malicious by an ML classifier with high confidence. It contains embedded JavaScript, which is used to obscure the payload and potentially exploit PDF reader vulnerabilities. The presence of JavaScript actions and encrypted content further indicates a malicious intent to deliver a hidden payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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_obj0029_000.js
89951bc91f61094665e9c48174a8c0f94af03f7a530cd625c48020d1b043f3f3		 pdf-javascript-stream PDF /JS object 29 at offset 0x1E2C 8603 bytes

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