Malicious PDF — malware analysis report

Static analysis result for SHA-256 028528b10ec9525e…

MALICIOUS

PDF

11.0 KB
MD5: 38458241f156d708baac851f41d7b480 SHA-1: d3d6e7cd488a85ce6334f064063a079bb5a36947 SHA-256: 028528b10ec9525e55a3f4d472a75c0b4b090b883cd0d298e504445560ead695
190 Risk Score

Malware Insights

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

This PDF file contains XFA (XML Forms Architecture) which is known to be a vector for exploitation. The embedded JavaScript, triggered by the 'initialize' event, appears to be obfuscated and attempts to execute code. The ML classifier strongly indicates maliciousness, and the presence of XFA heap spray exploit code further supports this. The script's ultimate goal is likely to download and execute a second-stage payload, though the exact mechanism is obscured.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 7

  • 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.
  • eval() call high PDF_EVAL
    eval() found — commonly used for obfuscated exploit execution
  • 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/

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
embedded_pdf_script_00001b97.bin
8390500545e5c079f2057c4bcee2ad1a84bbe61713cbb570b409f30db1efbf99		 pdf-embedded-script PDF raw stream script payload at offset 0x1B97 4413 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 1 eval/decoder/string-building token(s).

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