Malicious PDF — malware analysis report

Static analysis result for SHA-256 7476e105e3c7cc47…

MALICIOUS

PDF

14.9 KB Created: 2010-09-15 17:58:18 Authoring application: hay wab
MD5: 0523eab3ac754f987e9e52b5667c36f7 SHA-1: a8113aac1f22e9ad064cbcec2ab22a0727e1babd SHA-256: 7476e105e3c7cc478df49c152ab5076977170d5d2a12f155b4e1267927c5fa33
198 Risk Score

Malware Insights

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

The PDF sample contains XFA form elements and triggers a heap spray exploit via JavaScript. This exploit is designed to execute arbitrary code, likely to download and run a secondary payload. The presence of an embedded file, specifically 'embedded_file_obj0009.bin', suggests it is the payload or part of the exploit chain.

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_obj0001.bin
d81baa73e490e4cb879e13927cacd1dd1be37524a37eac51603e15117c578777		 pdf-embedded-file PDF EmbeddedFile object 1 at offset 0x907 84 bytes
embedded_file_obj0011.bin
24c130f03a4cf51d470b536e94c1e58af67665739e200e0ce198ad41086243c0		 pdf-embedded-file PDF EmbeddedFile object 11 at offset 0x9B9 228 bytes
embedded_file_obj0014.bin
c97e0522381d6196cc0695f35f4d065f15c9c86a9601a7f776c6afd3f4c6b460		 pdf-embedded-file PDF EmbeddedFile object 14 at offset 0xAAA 199 bytes
embedded_file_obj0013.bin
3c3b0fc7708060b48a4936222e137c95681c7df7e33be18b4e0278515be32da8		 pdf-embedded-file PDF EmbeddedFile object 13 at offset 0xB9B 119 bytes
embedded_file_obj0004.bin
e6c26a3478346d27e841ad49868ebf68bf4c6863b6750e8d60bda3c4c6f79876		 pdf-embedded-file PDF EmbeddedFile object 4 at offset 0xC51 77 bytes
embedded_file_obj0005.bin
92a3ce61d783e15932b5de127ce45a9b4c2f98f4da2453f65241573c1dda808a		 pdf-embedded-file PDF EmbeddedFile object 5 at offset 0xCF7 56 bytes
embedded_file_obj0009.bin
3adf215b1d61f9aa6c4113f5810e8b5c42448d98273d560f705c3b7f7e232066		 pdf-embedded-file PDF EmbeddedFile object 9 at offset 0x1032 30205 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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