Malicious PDF — malware analysis report

Static analysis result for SHA-256 1b79d31e655eefdd…

MALICIOUS

PDF

16.5 KB
MD5: dcc1c9bcc6f61c4ee78c14dedbf23147 SHA-1: 2081c6b604ed6580f0b3cc176576978834b59dbd SHA-256: 1b79d31e655eefdd0128eda21ebdeff3bcabdf2f6c557c1169863603fb5d1d0f
148 Risk Score

Malware Insights

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

The PDF file contains embedded executable scripts and triggers multiple high-severity heuristics related to XFA forms and script execution. The ML classifier strongly indicates maliciousness. The embedded file 'embedded_file_obj0008.bin' is likely a payload. The PDF_UNESCAPE heuristic suggests obfuscated script content designed to be executed.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

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.
  • unescape() call high PDF_UNESCAPE
    unescape() found — often used to decode shellcode in PDF JS exploits
  • 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.
  • 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
  • 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/xfa-template/2.5/
    • http://www.xfa.org/schema/xfa-data/1.0/

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
embedded_file_obj0008.bin
21ca550af76c74d2fded7656bef253f45e28dbb8f8f55de5aaf176359baddb16		 pdf-embedded-file PDF EmbeddedFile object 8 at offset 0xC6 16141 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 1 eval/decoder/string-building token(s). Carved artifact contains 1 long base64-like blob(s).

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