Malicious PDF — malware analysis report

Static analysis result for SHA-256 6060bfdebe16cb3c…

MALICIOUS

PDF

14.1 KB Created: 2010-09-16 04:59:34 Authoring application: ana lip
MD5: ea94276b901a84bbaa38680d5beeb93d SHA-1: 8c3922962aaca523527b16609d1c8653741162bc SHA-256: 6060bfdebe16cb3c2b39f8780a2e4b95885346e976dfc16ecad3d3b421e315fa
198 Risk Score

Malware Insights

MITRE ATT&CK
T1059.007 JavaScript T1203 Exploitation for Client Execution T1566.001 Spearphishing Attachment

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 embedded scripts and the ML classifier's high confidence further support the malicious nature of this file. The benign URLs are likely unrelated to the malicious functionality.

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 0xA89 84 bytes
embedded_file_obj0018.bin
24c130f03a4cf51d470b536e94c1e58af67665739e200e0ce198ad41086243c0		 pdf-embedded-file PDF EmbeddedFile object 18 at offset 0xB3B 228 bytes
embedded_file_obj0003.bin
c97e0522381d6196cc0695f35f4d065f15c9c86a9601a7f776c6afd3f4c6b460		 pdf-embedded-file PDF EmbeddedFile object 3 at offset 0xC2B 199 bytes
embedded_file_obj0011.bin
5bb15809497842c1f8242c3d9ca1c2fb56db74919e97838e68326dcfde164be2		 pdf-embedded-file PDF EmbeddedFile object 11 at offset 0xD1C 119 bytes
embedded_file_obj0012.bin
e6c26a3478346d27e841ad49868ebf68bf4c6863b6750e8d60bda3c4c6f79876		 pdf-embedded-file PDF EmbeddedFile object 12 at offset 0xDD4 77 bytes
embedded_file_obj0002.bin
92a3ce61d783e15932b5de127ce45a9b4c2f98f4da2453f65241573c1dda808a		 pdf-embedded-file PDF EmbeddedFile object 2 at offset 0xE7A 56 bytes
embedded_file_obj0006.bin
f9503769688bedac3e86f4a9ce51d57f4e8c31fc3ac70a63d39215dd547e17d8		 pdf-embedded-file PDF EmbeddedFile object 6 at offset 0x11B1 15838 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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