Malicious PDF — malware analysis report

Static analysis result for SHA-256 6a6363e8838fb936…

MALICIOUS

PDF

10.2 KB
MD5: 06cf533b0a5e3d1efd688b0eb5456bf7 SHA-1: b96a6008def4356bc755e5bb7f0a3bde871cb4a4 SHA-256: 6a6363e8838fb9365327905521fdd557c9a9850d05173965c0f881703707181d
64 Risk Score

Malware Insights

MITRE ATT&CK
T1059.007 JavaScript T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains XFA form elements and embedded scripts, strongly indicating malicious intent. The ML classifier output of 0.999966 further supports this. While the embedded URLs are benign, the presence of embedded files and scripts suggests the PDF is designed to exploit vulnerabilities or trick the user into executing a malicious payload, likely a downloader. The specific nature of the embedded script could not be fully determined due to obfuscation, but its presence alongside XFA forms points to an exploitation attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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 script payload in PDF stream low 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.
  • 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/
    • http://ns.adobe.com/xdp/
    • http://www.xfa.org/schema/xci/1.0/
    • http://www.xfa.org/schema/xfa-data/1.0/

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 0xBED 85 bytes
embedded_file_obj0042.bin
dda0835df994b8be920f715db36452f6cee7bb42bbc9c897f878a7b298ba8e91		 pdf-embedded-file PDF EmbeddedFile object 42 at offset 0xC9F 1029 bytes
embedded_file_obj0111.bin
530a1f4394fecb30967a73a6063103ebb4ef911b44be6a36501b2479e821bd4b		 pdf-embedded-file PDF EmbeddedFile object 111 at offset 0xEB9 67049 bytes
embedded_file_obj0044.bin
3dd68f00f4fcb366a2a3a17c65cb2626eeddf5ea5713302d374310561d810169		 pdf-embedded-file PDF EmbeddedFile object 44 at offset 0x2394 144 bytes
embedded_file_obj0045.bin
10c03f88a5f0a0833dc5b2c8ac295b3a3c6f65e23889eb8cc1dc6fe29bf7f275		 pdf-embedded-file PDF EmbeddedFile object 45 at offset 0x2441 77 bytes

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