Malicious PDF — malware analysis report

Static analysis result for SHA-256 25b96c386d446369…

MALICIOUS

PDF

1.03 MB
MD5: 72616c1816de2c87df021272f4d2f13c SHA-1: 484a521a1462bf883a14be6d0acb2989a2afc991 SHA-256: 25b96c386d446369dabaa1809e8ee062f8c2b52c37a69b947f1a1fc1b0743687
114 Risk Score

Malware Insights

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

The PDF contains JavaScript that uses the exportDataObject and nLaunch functions to automatically launch an embedded file named 'test.doc' when the document is opened. This is a common technique for delivering secondary payloads. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • exportDataObject + nLaunch — embedded-file launch-on-open dropper critical PDF_JS_EXPORT_LAUNCH_DROPPER
    PDF JavaScript calls exportDataObject() with nLaunch set, which extracts the document's embedded file and launches it in its default application. This is a launch-on-open dropper: the embedded file is the payload. No benign workflow auto-launches an extracted PDF attachment.
  • 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.
  • Embedded file low PDF_EMBEDDED
    PDF embeds a file attachment — could carry an executable or another weaponised document as a nested payload

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
test.doc
b572c0ef43dd6c8e6fda9cdba2adb7ab8dfe074981d62d582d8457ae3f96c7f9		 pdf-embedded-file PDF EmbeddedFile object 8 at offset 0x53E 2260513 bytes
javascript_obj0009_000.js
f4202c85a4cb93d4b82b9bb0b4ea5e174d56cb4c465226dabd1c563690942529		 pdf-javascript-stream PDF /JS object 9 at offset 0x107723 57 bytes
javascript_obj0009_001.js
b8cebed679e527f70945c094cd6d1a6534ebe9b43e42651bc56cefb684263b2d		 pdf-javascript-stream PDF /JS object 9 at offset 0x107723 55 bytes
combined_document_js_000.js
e60daab43579d25aff483960fbdbd97820f26c372a72ad34ceb3140ad2331d93		 deobfuscated-js combined document JavaScript streams at offset 0x107723 113 bytes

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