Malicious PDF — malware analysis report

Static analysis result for SHA-256 c2f04ec631aa9e56…

MALICIOUS

PDF

46.6 KB Authoring application: 52,164,161,159,117,154,147,164,117,161,150,151,90,145,123,105,144,145,123,106,91,109,175,164,151,166,167,164,160,82,145,123,103,175,152,167,160,149,166,155,161,160,82,145,123,107,90,145,123,104,91,173 (via 1,154,119,162,107,152,161,116,125,97,97,97,97,97,169,115,115,115,115,116,115,115,115,115,115,115,115,115,115,115,115,115,131,115,115,115,115,115,115,115,115,139,170,117,115,133,155,115,153,139,115,97,)
MD5: d2adf5ed5fb8bf287786ea3070e49c10 SHA-1: f7e7d7e0cd9d569df434c663950afacc6a32939d SHA-256: c2f04ec631aa9e562caa25442eefe9d44a19f2d3f1448cdbdabc1d10bf970eca
184 Risk Score

Malware Insights

MITRE ATT&CK
T1204 Malicious Link T1059 Command and Scripting Interpreter T1059.001 PowerShell

This PDF document was flagged as malicious by ClamAV (Pdf.Exploit.Agent-36962) and a machine learning classifier. It contains an XFA form with a risky executable script, indicating an attempt to exploit PDF viewer vulnerabilities. The script is likely designed to download and execute a second-stage payload, although the exact mechanism is obfuscated. The presence of embedded files further supports a multi-stage attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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 7

Files carved from inside the sample during analysis.

FilenameKindSourceSize
embedded_file_obj0041.bin
c06dcd026a7ea0536b63e07ce688691b585339a3ab7ff59065e546b56308c7bb		 pdf-embedded-file PDF EmbeddedFile object 41 at offset 0x948A 85 bytes
embedded_file_obj0042.bin
b40a217a8d9b8d3671cc3874c550d30941b93ca6dde99995d43921dede579865		 pdf-embedded-file PDF EmbeddedFile object 42 at offset 0x953C 1183 bytes
embedded_file_obj0043.bin
95c4f74f827df80dda8209466122edf54fa23ed66adff9c622ee796f7b6cf233		 pdf-embedded-file PDF EmbeddedFile object 43 at offset 0x978E 2943 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 0x9D45 144 bytes
embedded_file_obj0045.bin
ce4a3f07835c725838e55947d6b1f21771e0ad8084ee86d0890ecc12bd5231fd		 pdf-embedded-file PDF EmbeddedFile object 45 at offset 0x9E07 2427 bytes
font_00_cff_off00003551.bin
23831e143e2e1a484b95ee765b15d94562c951468b895c080e655667dc04ddf0		 pdf-font-stream PDF embedded font (cff) at offset 0x3551 31178 bytes
font_01_cff_off0000a1d7.bin
062eede2d0cc5d3972869dc7e2f2f9f01d1d1b3756b715c8252f06948ce99ae2		 pdf-font-stream PDF embedded font (cff) at offset 0xA1D7 1192 bytes

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