Malicious PDF — malware analysis report

Static analysis result for SHA-256 643d192565164170…

MALICIOUS

PDF

14.2 KB
MD5: 739488874d9a2b53cef90d8e49e77b46 SHA-1: 337a63cd3f54515195d358760c5265d08e286785 SHA-256: 643d1925651641703a71e415d72d36253d2ced23f52d04072aded2e0e927ae6c
156 Risk Score

Malware Insights

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

The PDF document contains heuristics indicating it is an XFA form with a stager designed to evaluate base-26 encoded content, strongly suggesting it's an exploit. ClamAV detection as 'Pdf.Exploit.Agent-36962' further confirms its malicious nature. The presence of embedded files and the XFA exploit pattern indicate the likely download and execution of a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 6

  • ClamAV: Pdf.Exploit.Agent-36962 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Exploit.Agent-36962
  • XFA title base-26 eval stager high PDF_XFA_TITLE_BASE26_EVAL_STAGER
    PDF XFA initialize script reads an encoded payload from the document title, builds event.target.eval and String.fromCharCode from string fragments, decodes base-26 character pairs, and evals the recovered stage. This is an exploit-kit staging pattern; the static bytes do not prove a specific CVE by themselves.
  • 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/
    • http://ns.adobe.com/xdp/
    • http://www.xfa.org/schema/xci/1.0/
    • http://www.xfa.org/schema/xfa-template/2.2/
    • 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 0x2AD6 85 bytes
embedded_file_obj0042.bin
dda0835df994b8be920f715db36452f6cee7bb42bbc9c897f878a7b298ba8e91		 pdf-embedded-file PDF EmbeddedFile object 42 at offset 0x2B88 1029 bytes
embedded_file_obj0043.bin
d7f7bd6434fff4670f50233bfe5cf596fac9d4d44d97771942e495ed6801d5e8		 pdf-embedded-file PDF EmbeddedFile object 43 at offset 0x2DA1 1949 bytes
embedded_file_obj0044.bin
3dd68f00f4fcb366a2a3a17c65cb2626eeddf5ea5713302d374310561d810169		 pdf-embedded-file PDF EmbeddedFile object 44 at offset 0x3228 144 bytes
embedded_file_obj0045.bin
10c03f88a5f0a0833dc5b2c8ac295b3a3c6f65e23889eb8cc1dc6fe29bf7f275		 pdf-embedded-file PDF EmbeddedFile object 45 at offset 0x32D4 77 bytes

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