Malicious PDF — malware analysis report

Static analysis result for SHA-256 4fe54a9f13c5c775…

MALICIOUS

PDF

1.95 MB Authoring application: 6-74-92-81-72-154-129-92-126-104-80-77-146-148-129-146-147-145-71-136-75-81-72-90-130-92-143-128-145-146-132-104-141-147-71-129-75-80-85-72-90-145-132-147-74-92-114-147-145-136-141-134-77-133-145-142- (via -84-71-72-90-136-133-71-126-137-83-91-88-79-79-79-72-154-126-137-84-92-70-142-74-148-96-114-137-134-134-134-138-143-148-107-83-97-106-78-78-78-78-78-150-96-96-96-96-97-96-96-96-96-96-96-96-96-96-96-96)
MD5: 7998f742e7a80c7b67b1dea0358975c1 SHA-1: 925479ac93ac1dca92a3ec1e10aac576471e0add SHA-256: 4fe54a9f13c5c7754b0807654b7de72f8448fe09cbb31c52dd17da0f7090880b
154 Risk Score

Malware Insights

MITRE ATT&CK
T1059.001 PowerShell T1204.002 Malicious File

The PDF file contains a critical XFA form with a risky executable script, as indicated by the PDF_XFA_SCRIPT heuristic. ClamAV also detected this file as Pdf.Exploit.Agent-36962, suggesting it's a known exploit. The embedded script payload and the presence of an embedded file (embedded_file_obj0043.bin) strongly suggest the document is designed to download and execute a second-stage payload.

Heuristics 9

  • 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
  • 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
  • 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)
  • 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#
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/

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 0x3E08 85 bytes
embedded_file_obj0042.bin
b40a217a8d9b8d3671cc3874c550d30941b93ca6dde99995d43921dede579865		 pdf-embedded-file PDF EmbeddedFile object 42 at offset 0x3EBA 1183 bytes
embedded_file_obj0043.bin
81c2b4a851d18a891e52f68485969866c079d57b9917ca76cf1ccd86b1dbf142		 pdf-embedded-file PDF EmbeddedFile object 43 at offset 0x410A 1639 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 1 eval/decoder/string-building token(s).
embedded_file_obj0044.bin
3dd68f00f4fcb366a2a3a17c65cb2626eeddf5ea5713302d374310561d810169		 pdf-embedded-file PDF EmbeddedFile object 44 at offset 0x44BD 144 bytes
embedded_file_obj0045.bin
ce4a3f07835c725838e55947d6b1f21771e0ad8084ee86d0890ecc12bd5231fd		 pdf-embedded-file PDF EmbeddedFile object 45 at offset 0x457F 2427 bytes
font_00_cff_off0000494f.bin
062eede2d0cc5d3972869dc7e2f2f9f01d1d1b3756b715c8252f06948ce99ae2		 pdf-font-stream PDF embedded font (cff) at offset 0x494F 1192 bytes

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