Malicious PDF — malware analysis report

Static analysis result for SHA-256 c096b06da39eb89c…

MALICIOUS

PDF

45.1 KB
MD5: f0dd1d3f53d313681ee069c17788d400 SHA-1: da5d239510d8bfca701d22092a8635d600b98cc5 SHA-256: c096b06da39eb89c804da6bbe921641fe4d332e58f5b6a0c9c53948bee5680c4
74 Risk Score

Malware Insights

MITRE ATT&CK
T1059.001 PowerShell T1204.002 Malicious File

The PDF file contains embedded JavaScript and utilizes ASCIIHexDecode filters, which are common indicators of malicious PDFs. The ML classifier strongly flagged this file as malicious. The embedded JavaScript is likely responsible for downloading and executing a second-stage payload, though its exact function is obscured by obfuscation. The presence of XFA form elements also suggests a potential attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

Heuristics 5

  • 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
  • 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://ns.adobe.com/xdp/
    • http://www.xfa.org/schema/xci/2.6/
    • http://www.xfa.org/schema/xfa-template/24444.6/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
javascript_obj0011_000.js
684b219ec31d517d0d923860e55c62481aef7973585ad66ffeb574e0e7ece257		 pdf-javascript-stream PDF /JS object 11 at offset 0xA1D0 3902 bytes
font_00_sfnt_off00000451.bin
4f69fdbf43eabdd5abc64b7ad9a9f03684a5a3891541c393a6d57875ac98036c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x451 65932 bytes

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