Malicious PDF — malware analysis report

Static analysis result for SHA-256 0f3776864506ddaa…

MALICIOUS

PDF

35.1 KB Created: ËÚwÁÍÀ10ŠÍBbM¡vÂ로‡ü½ Authoring application: qE²ü‚c¸”%V’4 (via qE¡ü‚i¸‘%V’#é©)
MD5: 168659e604c00e01d91b91aa6879e40f SHA-1: da23f7d74f6cdd349879a7acab8123b8ab1db555 SHA-256: 0f3776864506ddaafbbb5abfca42612a368e395b3fa6ba1366bca770f0341c7c
94 Risk Score

Malware Insights

MITRE ATT&CK
T1059.007 JavaScript T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by an ML classifier and contains embedded JavaScript. The JavaScript appears to be obfuscated but is likely responsible for downloading and executing a second-stage payload. The presence of JavaScript within an encrypted PDF suggests an attempt to hide malicious activity from static analysis.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 4

  • 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.
  • Optional Content Group with action trigger low PDF_OPTIONAL_CONTENT
    Optional Content Group (layer) co-occurs with an action trigger — content can be selectively hidden from viewers or scanners while the action still fires on open

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
javascript_obj0008_000.js
b5fc3244577466b9be26bebc0c9e6ac8d91af36f1d09a778c5d7de40523080d0		 pdf-javascript-stream PDF /JS object 8 at offset 0x4EE 2047 bytes
javascript_obj0009_000.js
71781213e3270e4684e71b049f0a83f2e4320a02aae5e32b5dd32c7f9852b3f2		 pdf-javascript-stream PDF /JS object 9 at offset 0x3C6 33286 bytes

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