Malicious PDF — malware analysis report

Static analysis result for SHA-256 855806599ae2916e…

MALICIOUS

PDF

13.1 KB
MD5: 329590a174efb923407e8d2d3a96a8f1 SHA-1: fd03ec0e237172922369e4ab3063d19c7bd5b7b9 SHA-256: 855806599ae2916e942fdda6b508ebe0058d2d88364e421347a283de17e1475d
66 Risk Score

Malware Insights

MITRE ATT&CK
T1204.002 Malicious File T1566.002 Spearphishing Attachment

The PDF was flagged by a machine learning classifier as malicious with a high confidence score. It contains an embedded script payload and an embedded file, indicating an attempt to deliver a secondary malicious component. The presence of XFA forms and embedded files suggests a potential exploit delivery mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • Embedded script payload in PDF stream medium PDF_EMBEDDED_SCRIPT_PAYLOAD
    PDF stream bytes contain an HTML/XFA <script> tag without accompanying Windows shell-execution primitives — common in accessible XFA forms but worth surfacing for analyst review.
  • Embedded file low PDF_EMBEDDED
    PDF embeds a file attachment — could carry an executable or another weaponised document as a nested payload
  • 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/
    • http://www.xfa.org/schema/xfa-template/2.5/
    • http://www.xfa.org/schema/xfa-data/1.0/

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
embedded_file_obj0008.bin
607386ad1864aae6faa9425db7fa5cd5ef84cb9bf4bc748b2062bdfbbaa411bf		 pdf-embedded-file PDF EmbeddedFile object 8 at offset 0xD5 12628 bytes

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