Malicious PDF — malware analysis report

Static analysis result for SHA-256 02a56b9d199f7987…

MALICIOUS

PDF

114.3 KB Created: 2011-06-30 01:43:04 Authoring application: sjzd7 sjzd7
MD5: db4d9bbeb75795f19711cffdf999bc18 SHA-1: af2501973a4ec282d6150eda698bdbec8b2a512d SHA-256: 02a56b9d199f7987734414b284320be69d07c1b0aff30466bdd7fe74952ea335
128 Risk Score

Malware Insights

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

The PDF document contains XFA forms and embedded scripts, indicated by high-severity heuristics like PDF_XFA_SCRIPT and PDF_EMBEDDED_SCRIPT_PAYLOAD. The ML classifier also flagged this PDF as malicious with high confidence. The embedded script likely downloads and executes a second-stage payload, as suggested by the presence of an embedded file artifact. The primary attack vector is likely spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 9

  • 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.
  • ASCIIHexDecode filter (with exploit indicators) medium PDF_FILTER_HEX
    Hex-encoding filter present alongside exploit delivery indicators — often used to hide payload or shellcode bytes
  • 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
  • String.fromCharCode low PDF_FROMCHARCODE
    String.fromCharCode found — used to construct payload strings dynamically. Common in benign JavaScript libraries for codepoint manipulation, so this alone is informational; weaponised use is also caught by the dedicated fromCharCode-stage and exploit-shape rules. (matched inside decoded stream)
  • 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.
  • PDF differential parser failed info PDF_DIFFERENTIAL_PARSE_FAILED
    The cross-check parser (pdfminer.six) failed on this file: PDF differential parser failed: AssertionError. Static heuristics still ran and any of their findings above are valid; only the differential cross-check signal is missing.
  • 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_obj0017.bin
d81baa73e490e4cb879e13927cacd1dd1be37524a37eac51603e15117c578777		 pdf-embedded-file PDF EmbeddedFile object 17 at offset 0x291 84 bytes
embedded_file_obj0015.bin
24c130f03a4cf51d470b536e94c1e58af67665739e200e0ce198ad41086243c0		 pdf-embedded-file PDF EmbeddedFile object 15 at offset 0x381 228 bytes
embedded_file_obj0009.bin
c97e0522381d6196cc0695f35f4d065f15c9c86a9601a7f776c6afd3f4c6b460		 pdf-embedded-file PDF EmbeddedFile object 9 at offset 0x4C4 199 bytes
embedded_file_obj0007.bin
5d4e84174057e0420bee56de4c7349843dd5b848aedfa14b52347483a9e7dca5		 pdf-embedded-file PDF EmbeddedFile object 7 at offset 0x605 138 bytes
embedded_file_obj0016.bin
e6c26a3478346d27e841ad49868ebf68bf4c6863b6750e8d60bda3c4c6f79876		 pdf-embedded-file PDF EmbeddedFile object 16 at offset 0x714 77 bytes
embedded_file_obj0018.bin
92a3ce61d783e15932b5de127ce45a9b4c2f98f4da2453f65241573c1dda808a		 pdf-embedded-file PDF EmbeddedFile object 18 at offset 0x7F8 56 bytes
embedded_file_obj0008.bin
68a0cb0a39f4d284fcb065929c41affb64bf22f3336ce8e0120f0f7612915465		 pdf-embedded-file PDF EmbeddedFile object 8 at offset 0xBCC 57324 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 1 eval/decoder/string-building token(s).

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