Malicious PDF — malware analysis report

Static analysis result for SHA-256 767fafbee7b632dd…

MALICIOUS

PDF

10.7 KB Created: 2010-11-29 18:40:18 Authoring application: piu peh
MD5: 07be3a4aa0198b2ff6ab1eb81389c849 SHA-1: 414e54e347595317437e0c8102cc5c4bc5d45685 SHA-256: 767fafbee7b632dd77d71b55aa621d9a3a6c1de89e494dd9ca801895a050a87d
198 Risk Score

Malware Insights

MITRE ATT&CK
T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF sample contains XFA (XML Forms Architecture) which is known to be vulnerable to heap spray attacks when processed with JavaScript. The heuristic firings indicate the presence of XFA JavaScript heap-spray exploit code and an embedded script payload. This suggests the primary function of the file is to exploit this vulnerability to download and execute a secondary payload, likely contained within the embedded file artifact.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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.
  • XFA JavaScript heap-spray exploit code critical PDF_XFA_HEAP_SPRAY
    PDF contains XFA script content with heap-spray or shellcode-like JavaScript markers such as large encoded word sequences, util.pack, large arrays, or spray variable names. This is a weaponised Adobe Reader exploit pattern, not a normal interactive form.
  • unescape() call high PDF_UNESCAPE
    unescape() found — often used to decode shellcode in PDF JS exploits (matched inside decoded stream)
  • 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
  • Embedded script payload in PDF stream low 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.
  • 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://ns.adobe.com/xdp/
    • http://www.xfa.org/schema/xci/1.0/
    • http://ns.adobe.com/xtd/
    • http://www.xfa.org/schema/xfa-data/1.0/
    • http://ns.adobe.com/xfdf/
    • http://www.xfa.org/schema/xfa-form/2.8/
    • http://www.xfa.org/schema/xfa-template/2.5/

Extracted artifacts 7

Files carved from inside the sample during analysis.

FilenameKindSourceSize
embedded_file_obj0019.bin
d81baa73e490e4cb879e13927cacd1dd1be37524a37eac51603e15117c578777		 pdf-embedded-file PDF EmbeddedFile object 19 at offset 0xB72 84 bytes
embedded_file_obj0009.bin
24c130f03a4cf51d470b536e94c1e58af67665739e200e0ce198ad41086243c0		 pdf-embedded-file PDF EmbeddedFile object 9 at offset 0xC23 228 bytes
embedded_file_obj0006.bin
c97e0522381d6196cc0695f35f4d065f15c9c86a9601a7f776c6afd3f4c6b460		 pdf-embedded-file PDF EmbeddedFile object 6 at offset 0xD13 199 bytes
embedded_file_obj0001.bin
095d3704aabd2e760e837bf76842ffb86c89ef74a7e4f964acf00ba7d2b2baba		 pdf-embedded-file PDF EmbeddedFile object 1 at offset 0xE03 119 bytes
embedded_file_obj0005.bin
e6c26a3478346d27e841ad49868ebf68bf4c6863b6750e8d60bda3c4c6f79876		 pdf-embedded-file PDF EmbeddedFile object 5 at offset 0xEBA 77 bytes
embedded_file_obj0018.bin
92a3ce61d783e15932b5de127ce45a9b4c2f98f4da2453f65241573c1dda808a		 pdf-embedded-file PDF EmbeddedFile object 18 at offset 0xF61 56 bytes
embedded_file_obj0012.bin
9d12a00f5ae9c0b7ac68d83d98c17213903ae72652332aa0ac5a56b752e9cb00		 pdf-embedded-file PDF EmbeddedFile object 12 at offset 0x129A 11484 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 1 eval/decoder/string-building token(s). Carved artifact contains 5 long base64-like blob(s).

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