Malicious PDF — malware analysis report

Static analysis result for SHA-256 67477e3b8aa9f251…

MALICIOUS

PDF

22.7 KB Authoring application: 104-85-68-126-139-88-72-90-126-104-84-74-92-114-147-145-136-141-134-77-133-145-142-140-98-135-128-145-98-142-131-132-71-126-104-86-125-126-104-87-72-90-156-145-132-147-148-145-141-63-126-104-84-156-13 (via -156-132-139-146-132-154-126-137-84-92-70-138-97-74-96-114-137-136-112-135-100-143-88-133-142-97-106-78-78-78-78-78-150-96-96-96-96-97-96-96-96-96-96-96-96-96-96-96-96-96-112-96-96-96-96-96-96-96-96-1)
MD5: 86e5f30fe5d4a6b5759ec82d401813fe SHA-1: 7efb8247c6a5eed24f6e329dfd7d7b7efbbc9ea0 SHA-256: 67477e3b8aa9f251359ac6a8358a4a178508a7de68fb82d2ab6ab5ce1ba7d642
214 Risk Score

Malware Insights

MITRE ATT&CK
T1203 Exploitation for Client Execution T1059.007 JavaScript

The PDF file contains XFA form elements and uses JavaScript eval() and String.fromCharCode() functions, indicating an attempt to execute code. ClamAV detected this as Pdf.Exploit.Agent-36962, and ML classification strongly suggests maliciousness. The embedded script likely downloads and executes a secondary payload, aligning with exploitation for client execution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

Heuristics 10

  • XFA form contains risky executable script high CVE related PDF_XFA_SCRIPT
    PDF embeds an XFA form whose script block contains exploit, submission/launch, or shell-execution primitives. Ordinary LiveCycle print/update scripts are left as generic XFA/JS signals unless stronger behavior is present.
  • ClamAV: Pdf.Exploit.Agent-36962 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Exploit.Agent-36962
  • eval() call high PDF_EVAL
    eval() found — commonly used for obfuscated exploit execution (matched inside decoded stream)
  • 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
  • String.fromCharCode low PDF_FROMCHARCODE
    String.fromCharCode found — used to construct payload strings dynamically. Common in benign JavaScript libraries for codepoint manipulation, so this alone is informational; weaponised use is also caught by the dedicated fromCharCode-stage and exploit-shape rules. (matched inside decoded stream)
  • 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
  • Suspicious extracted artifact info EXTRACTED_FILE_STATIC_TRIAGE
    One or more files extracted from inside this sample matched static suspicious-content checks such as script obfuscation, encoded payload blobs, packed data, or execution/download terms.
  • 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.w3.org/1999/02/22-rdf-syntax-ns# In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xdp/In PDF document text
    • http://www.xfa.org/schema/xci/1.0/In PDF document text
    • http://www.xfa.org/schema/xfa-template/2.2/In PDF document text
    • http://www.xfa.org/schema/xfa-data/1.0/In PDF document text
    • http://www.xfa.org/schema/xfa-locale-set/2.1/In PDF document text

Extracted artifacts 6

Files carved from inside the sample during analysis.

FilenameKindSourceSize
embedded_file_obj0041.bin
c06dcd026a7ea0536b63e07ce688691b585339a3ab7ff59065e546b56308c7bb		 pdf-embedded-file PDF EmbeddedFile object 41 at offset 0x378D 85 bytes
embedded_file_obj0042.bin
b40a217a8d9b8d3671cc3874c550d30941b93ca6dde99995d43921dede579865		 pdf-embedded-file PDF EmbeddedFile object 42 at offset 0x383F 1183 bytes
embedded_file_obj0043.bin
4bac7be7864b34eb5b41bfb96cadbcef26b5f80d09f3f5851b0bc212eaeea45b		 pdf-embedded-file PDF EmbeddedFile object 43 at offset 0x3A8F 1582 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 2 eval/decoder/string-building token(s).
embedded_file_obj0044.bin
3dd68f00f4fcb366a2a3a17c65cb2626eeddf5ea5713302d374310561d810169		 pdf-embedded-file PDF EmbeddedFile object 44 at offset 0x3E18 144 bytes
embedded_file_obj0045.bin
ce4a3f07835c725838e55947d6b1f21771e0ad8084ee86d0890ecc12bd5231fd		 pdf-embedded-file PDF EmbeddedFile object 45 at offset 0x3EDA 2427 bytes
font_00_cff_off000042aa.bin
062eede2d0cc5d3972869dc7e2f2f9f01d1d1b3756b715c8252f06948ce99ae2		 pdf-font-stream PDF embedded font (cff) at offset 0x42AA 1192 bytes

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