Malicious PDF — malware analysis report

Static analysis result for SHA-256 d55aa45223606db7…

MALICIOUS

PDF

745.3 KB
MD5: 9c5cd8f4a5988acae6c2e2dce563446a SHA-1: 18272cf888d8779d466901864537b732f842c351 SHA-256: d55aa45223606db795d29ab9e341c1c703e5a2e26bd98402779f52b6c2e9da2b
204 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and a secondary embedded PDF, flagged by multiple heuristics including ClamAV and a machine learning classifier. The embedded JavaScript is likely responsible for downloading and executing the secondary PDF, which is a common technique for dropper malware. The ML classifier output of 0.998702 and the ClamAV detection 'Pdf.Dropper.Agent-5345715-0' strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

Heuristics 9

  • Secondary embedded PDF body has suspicious static findings critical POLYGLOT_CHILD_PDF_STATIC_TRIAGE
    A valid PDF body was found at a nonzero offset inside another container and its carved contents matched PDF exploit or lure heuristics. This catches polyglots where the top-level magic routes to ZIP/OLE while a PDF reader or downstream parser opens the hidden PDF payload.
  • ClamAV: Pdf.Dropper.Agent-5345715-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Dropper.Agent-5345715-0
  • ASCIIHexDecode filter (with exploit indicators) medium PDF_FILTER_HEX
    Hex-encoding filter present alongside exploit delivery indicators — often used to hide payload or shellcode bytes
  • JavaScript action low PDF_JAVASCRIPT
    PDF contains a /JavaScript action. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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
  • 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/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/xfa/promoted-desc/
    • http://ns.adobe.com/xdp/
    • http://www.xfa.org/schema/xci/2.6/
    • http://www.xfa.org/schema/xfa-template/2.6/
    • http://www.xfa.org/schema/xfa-locale-set/2.7/
    • http://www.xfa.org/schema/xfa-locale-set/2.6/
    • http://www.xfa.org/schema/xfa-form/2.8/
    • http://www.xfa.org/schema/xfa-data/1.0/

Extracted artifacts 7

Files carved from inside the sample during analysis.

FilenameKindSourceSize
javascript_obj0026_000.js
1d1885b6c800938e7ec00d369726a3bf52b65eebedcdd60cc006c36da6cab07f		 pdf-javascript-stream PDF /JS object 26 at offset 0x47BF 9609 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 1 eval/decoder/string-building token(s).
font_00_sfnt_off000070c8.bin
e31f8c8507e52f29008d946a00becde9f839e34cb108985ce66167bf881adafa		 pdf-font-stream PDF embedded font (sfnt) at offset 0x70C8 8084 bytes
font_10_sfnt_off000149fa.bin
422bc5698ba5d9d4818f6a2d8b3abca2f723e713b44a15c390139d2c976a1388		 pdf-font-stream PDF embedded font (sfnt) at offset 0x149FA 65932 bytes
font_11_sfnt_off0001e85c.bin
7e24ee16c8b09ee74d61445f29c3c0a95abfdf17fc1008606394f159dbd0c106		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1E85C 65932 bytes
font_12_sfnt_off000286ba.bin
57e24925bc6bdb98d38e8b4ba3b87f80f75c5e49ea9a522486790d7dc6848549		 pdf-font-stream PDF embedded font (sfnt) at offset 0x286BA 65932 bytes
font_13_sfnt_off000324e1.bin
1f068d668b316fcb46f0801be00137fb749cc7fda5ca15e442829d6c303d8f99		 pdf-font-stream PDF embedded font (sfnt) at offset 0x324E1 65932 bytes
polyglot_child_pdf_off0003ca8f.pdf
63f4cfa973525be2ab35fb007f9f04339c7c4e04754a602478a35f51580f1820		 polyglot-child-pdf Secondary PDF body inside pdf container at offset 0x3CA8F 514725 bytes

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