Malicious PDF — malware analysis report

Static analysis result for SHA-256 f11b630ce7613af3…

MALICIOUS

PDF

14.0 KB
MD5: 1705d62750b711b8b3bf2038aedd1cc0 SHA-1: 9d4ff401100dc9cb17f182aba4ab8c21ff5b483f SHA-256: f11b630ce7613af3d44a61d85d839526a67f8435113a0beb598300d681f497ec
74 Risk Score

Malware Insights

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

The PDF file contains embedded script payloads and is flagged by a machine learning classifier as malicious. The presence of an embedded file and an AcroForm button with an action trigger suggests an attempt to exploit PDF vulnerabilities. While no specific script content was readable, the overall structure and heuristic firings indicate a malicious PDF designed to deliver a secondary payload.

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
9ac9d9c854fa7722e39269f995b52fcf6c5315aad9ea7856b99669833d946219		 pdf-embedded-file PDF EmbeddedFile object 121 at offset 0xDCE 64760 bytes
embedded_file_obj0044.bin
3dd68f00f4fcb366a2a3a17c65cb2626eeddf5ea5713302d374310561d810169		 pdf-embedded-file PDF EmbeddedFile object 44 at offset 0x328B 144 bytes
embedded_file_obj0045.bin
10c03f88a5f0a0833dc5b2c8ac295b3a3c6f65e23889eb8cc1dc6fe29bf7f275		 pdf-embedded-file PDF EmbeddedFile object 45 at offset 0x3338 77 bytes

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