Malicious PDF — malware analysis report

Static analysis result for SHA-256 50fef6d7a90290a7…

MALICIOUS

PDF

70.1 KB
MD5: 37f04b09d864c2b4e0e47e36b8bf2c3f SHA-1: 1037de066d7a7f3b803608734a69b705a4ac50e4 SHA-256: 50fef6d7a90290a7acdc7e4f5139722d6b2bf60cfba24760fea07a11ff061519
66 Risk Score

Malware Insights

MITRE ATT&CK
T1059.001 PowerShell

The PDF file contains embedded JavaScript, indicated by the PDF_JAVASCRIPT and PDF_JS heuristics. The PDF_UNESCAPE heuristic suggests that the JavaScript is obfuscated, a common technique for hiding malicious intent. The embedded JavaScript stream, named 'javascript_obj0013_000.js', is the primary artifact of interest. While the document body is largely unreadable garbage, the presence of JavaScript and the unescape function strongly suggest that the script is designed to download and execute a secondary payload from a remote location, likely using the unknown-reputation URL http://www.bitstream.com.

Heuristics 6

  • unescape() call high PDF_UNESCAPE
    unescape() found — often used to decode shellcode in PDF JS exploits
  • 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
  • Suspicious extracted artifact info EXTRACTED_FILE_STATIC_TRIAGE
    One or more files extracted from inside this sample matched static suspicious-content checks such as script obfuscation, encoded payload blobs, packed data, or execution/download terms.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://www.bitstream.com
    • http://ns.adobe.com/xdp/
    • http://www.xfa.org/schema/xci/2.6/
    • http://www.xfa.org/schema/xfa-template/2.6/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
javascript_obj0013_000.js
d76c1384b6c7dcb751c99affaed398fce03cdf41dc04e9b5c76027003189eab4		 pdf-javascript-stream PDF /JS object 13 at offset 0x10531 3979 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 2 eval/decoder/string-building token(s). Carved artifact contains 1 long base64-like blob(s).
font_00_sfnt_off00000352.bin
a8f4d9b7d604c3c8a0bf3f9a31b9e952d467f98d118fdc784d95d689a14d8a33		 pdf-font-stream PDF embedded font (sfnt) at offset 0x352 65932 bytes

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