Malicious PDF — malware analysis report

Static analysis result for SHA-256 cfaa66f0d210a48e…

MALICIOUS

PDF

48.9 KB Created: 2012-11-07 05:34:10 +03:00 Authoring application: Adobe Designer 7.0
MD5: a8797c91aba7ff79dcf72a8b58e5fe73 SHA-1: c8c8f18dd73656f804db7a0e7d7bb84f5b8598a9 SHA-256: cfaa66f0d210a48eec83519d28f8d2dad67de905829c1697add314c57d7e2c53
156 Risk Score

Malware Insights

MITRE ATT&CK
T1059.001 PowerShell T1204.002 Malicious File T1566.001 Spearphishing Attachment T1071.001 Web Protocols

The PDF contains XFA forms with embedded JavaScript, indicated by the PDF_XFA_SCRIPT and PDF_EVAL heuristics. This script is likely designed to download and execute a secondary payload, as suggested by the PDF_EMBEDDED_SCRIPT_PAYLOAD firing and the ML_NYX_PDF_MALICIOUS score. The presence of embedded files further supports the malicious intent. The benign URLs extracted do not detract from the malicious nature indicated by the heuristics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

Heuristics 8

  • 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.
  • eval() call high PDF_EVAL
    eval() found — commonly used for obfuscated exploit execution (matched inside decoded stream)
  • 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
  • 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 8

Files carved from inside the sample during analysis.

FilenameKindSourceSize
embedded_file_obj0046.bin
c06dcd026a7ea0536b63e07ce688691b585339a3ab7ff59065e546b56308c7bb		 pdf-embedded-file PDF EmbeddedFile object 46 at offset 0x7524 85 bytes
embedded_file_obj0047.bin
f20aceb8dbc16d07642c756ca1ccc141a87f1f44f1a99949a4c6a6a8678b4c98		 pdf-embedded-file PDF EmbeddedFile object 47 at offset 0x75D6 1526 bytes
embedded_file_obj0048.bin
e85149fb980ea3a22c43959e877b7c401d98a5185a82928919846a58b442435f		 pdf-embedded-file PDF EmbeddedFile object 48 at offset 0x78A6 6078 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 1 eval/decoder/string-building token(s).
embedded_file_obj0049.bin
0b7fe2cbe79087012463f41fc1327af7a43b4981b1049b2448bcaa170e431454		 pdf-embedded-file PDF EmbeddedFile object 49 at offset 0x8515 171 bytes
embedded_file_obj0050.bin
cb11c8f9d1f88e25fb66ce82b3736fe08cf8253503209e92cac18f94ff0cdb0d		 pdf-embedded-file PDF EmbeddedFile object 50 at offset 0x85DE 6434 bytes
embedded_file_obj0051.bin
57045217c453d4674a08ad8778674bf199a7989a9505424a1815c016e6bb412f		 pdf-embedded-file PDF EmbeddedFile object 51 at offset 0x8ABB 212 bytes
font_00_cff_off000012d0.bin
23831e143e2e1a484b95ee765b15d94562c951468b895c080e655667dc04ddf0		 pdf-font-stream PDF embedded font (cff) at offset 0x12D0 31178 bytes
font_01_cff_off00008c20.bin
37cdfe30992c35e17bb1ba4ec29152e690c0c6963368131281a230c707bfdd56		 pdf-font-stream PDF embedded font (cff) at offset 0x8C20 4074 bytes

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