Malicious PDF — malware analysis report

Static analysis result for SHA-256 89711a1c2cccab48…

MALICIOUS

PDF

10.4 KB
MD5: 8db7b23923f40208565d46384b25d970 SHA-1: 47b0306f778b97d833d285fa49ea5c15c9554ffe SHA-256: 89711a1c2cccab4860b48889cbc5409c72b90c54e60f2cdb0bd4ab274432d79c
170 Risk Score

Malware Insights

MITRE ATT&CK
T1059.001 PowerShell T1204.002 Malicious File

The PDF sample contains XFA (XML Forms Architecture) which is known to be vulnerable to heap spray attacks. The heuristic PDF_XFA_HEAP_SPRAY indicates the presence of exploit code designed to trigger this vulnerability. The embedded JavaScript, identified by PDF_EMBEDDED_SCRIPT_PAYLOAD and PDF_XFA_SCRIPT, is likely responsible for executing the exploit. While the exact payload is not fully discernible due to obfuscation, the presence of heap spray code strongly suggests an attempt to download and execute a second-stage payload.

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
  • Embedded script payload in PDF stream medium 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.
  • XFA form low PDF_XFA
    PDF uses XML Forms Architecture — can contain script logic
  • 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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_001_off00000ad9.bin
26778a984aeee63b4bc638f7d3e61839423b6b1dd02fe008d8dd6288d7862bbb		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0xAD9 4371 bytes
embedded_pdf_script_00001ab0.bin
5a70a8bd0574f1860e6f949da5d4acbb4ed25fa5e24028613f254a4ddca4bedc		 pdf-embedded-script PDF raw stream script payload at offset 0x1AB0 3845 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 1 eval/decoder/string-building token(s).

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