Malicious PDF — malware analysis report

Static analysis result for SHA-256 2b4fceaa0c52c6e0…

MALICIOUS

PDF

48.9 KB Created: 2012-11-13 13:28:58 +03:00 Authoring application: Adobe Designer 7.0
MD5: b9eba06eac877a46dc325bd1b355e7b8 SHA-1: 310308cc04ed6f937af45211229459b05d7339cd SHA-256: 2b4fceaa0c52c6e03deb4186f026d0f818bfcacc361cf08357ff975d212f0855
156 Risk Score

Malware Insights

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

This PDF document contains high-severity heuristic firings indicating the presence of executable scripts and embedded files. The ML classifier strongly suggests malicious intent. The embedded script payload, likely an XFA form script, is designed to execute and potentially download further malicious content, as indicated by the 'PDF_XFA_SCRIPT' and 'PDF_EMBEDDED_SCRIPT_PAYLOAD' rules. The presence of an embedded file, 'embedded_file_obj0048.bin', further supports the delivery of a secondary payload.

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
6223c0d07823207c76b1076b542c91ef5eaaaab1988bdaaa757e9a230fdf0e5a		 pdf-embedded-file PDF EmbeddedFile object 48 at offset 0x78A6 6101 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 0x8526 171 bytes
embedded_file_obj0050.bin
cb11c8f9d1f88e25fb66ce82b3736fe08cf8253503209e92cac18f94ff0cdb0d		 pdf-embedded-file PDF EmbeddedFile object 50 at offset 0x85EF 6434 bytes
embedded_file_obj0051.bin
57045217c453d4674a08ad8778674bf199a7989a9505424a1815c016e6bb412f		 pdf-embedded-file PDF EmbeddedFile object 51 at offset 0x8ACC 212 bytes
font_00_cff_off000012d0.bin
23831e143e2e1a484b95ee765b15d94562c951468b895c080e655667dc04ddf0		 pdf-font-stream PDF embedded font (cff) at offset 0x12D0 31178 bytes
font_01_cff_off00008c31.bin
4fc69e9eb08c766ddd22ec85e8f9f840b25ab41e48750b42b8134fffaa9b56fb		 pdf-font-stream PDF embedded font (cff) at offset 0x8C31 4074 bytes

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