Malicious PDF — malware analysis report

Static analysis result for SHA-256 752b9327fcbe66eb…

MALICIOUS

PDF

27.6 KB
MD5: 3d537688deac4dc8aeab171387e9e1f0 SHA-1: 72dab4f1f82d47c5f5e503521bc3f0cce67f3448 SHA-256: 752b9327fcbe66ebb4c10e8926d6acef61aeb62996155bcca3e25f8861cdbbc2
98 Risk Score

Malware Insights

MITRE ATT&CK
T1059.007 JavaScript T1566.001 Spearphishing Attachment

This PDF file contains an embedded XFA form with executable JavaScript, flagged by multiple high-severity heuristics. The script is heavily obfuscated but appears to be designed to download and execute a second-stage payload. The ML classifier strongly indicates maliciousness. No specific family could be identified due to the obfuscation and lack of clear indicators.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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 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.
  • 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_00000ab8.bin
ab15b75e91e4ceb0579762b313142501b63b14dba44d0c0420ac2d330e459208		 pdf-embedded-script PDF raw stream script payload at offset 0xAB8 25552 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).

Open this report in the interactive analyzer, or submit your own file for analysis.