Malicious PDF — malware analysis report

Static analysis result for SHA-256 dcf1330ac0dec776…

MALICIOUS

PDF

228.0 KB
MD5: fded8af54c0559cf39fdcd8d55e4bb15 SHA-1: 0d81d4c843e6d94cf24ca6d985a9cd7fb8dc7c10 SHA-256: dcf1330ac0dec7767aefd3b8b0d1f1baf1ccd61a550cd2336371beb2ea99c069
102 Risk Score

Malware Insights

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

This PDF was flagged as malicious by an ML classifier and contains embedded JavaScript. The PDF is encrypted with JavaScript, indicating an attempt to hide its true payload from static analysis. The embedded JavaScript stream is the primary indicator of malicious activity, likely used to download and execute a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8000

Heuristics 5

  • 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.
  • 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
a43f0b69c865e581d019694840579b626acaac6307f09f8180c05beb4ea99bb0		 pdf-javascript-stream PDF /JS object 39 at offset 0x2113 3796 bytes

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