Malicious PDF — malware analysis report

Static analysis result for SHA-256 78bfadb9f1f3f91a…

MALICIOUS

PDF

14.0 KB
MD5: 03019e95fdff435670c9c3d6a165802b SHA-1: 0f7cde14658edba486497714aba10d64d7c6e9d4 SHA-256: 78bfadb9f1f3f91a3a679450585b79cb347a46dcfddab2407dcc02a6c54b26ac
74 Risk Score

Malware Insights

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

The PDF file contains embedded objects and triggers an embedded script payload, indicating it's designed to exploit vulnerabilities. The ML classifier strongly flags this PDF as malicious. While no specific script content was readable, the presence of embedded files and the XFA form suggest a malicious document designed to execute code or download further stages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

Heuristics 5

  • 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
  • AcroForm button with action trigger low PDF_ACROFORM_BUTTON
    PDF contains a /Btn form field together with a SubmitForm/URI/Launch/JS trigger — this is the building block of fake 'Download' or 'Open' button overlays used in PDF phishing lures
  • 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.xfa.org/schema/xfa-locale-set/2.1/

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
embedded_file_obj0041.bin
c06dcd026a7ea0536b63e07ce688691b585339a3ab7ff59065e546b56308c7bb		 pdf-embedded-file PDF EmbeddedFile object 41 at offset 0xB02 85 bytes
embedded_file_obj0042.bin
dda0835df994b8be920f715db36452f6cee7bb42bbc9c897f878a7b298ba8e91		 pdf-embedded-file PDF EmbeddedFile object 42 at offset 0xBB4 1029 bytes
embedded_file_obj0121.bin
20fe4cbf1dd7cb298d885935ddc9171a6c72078493f35f2b318dde08b1d843d6		 pdf-embedded-file PDF EmbeddedFile object 121 at offset 0xDCE 65912 bytes
embedded_file_obj0044.bin
3dd68f00f4fcb366a2a3a17c65cb2626eeddf5ea5713302d374310561d810169		 pdf-embedded-file PDF EmbeddedFile object 44 at offset 0x32C6 144 bytes
embedded_file_obj0045.bin
10c03f88a5f0a0833dc5b2c8ac295b3a3c6f65e23889eb8cc1dc6fe29bf7f275		 pdf-embedded-file PDF EmbeddedFile object 45 at offset 0x3373 77 bytes

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