Malicious PDF — malware analysis report

Static analysis result for SHA-256 875f82d57e203781…

MALICIOUS

PDF

26.1 KB
MD5: 51140d7412dca6c1590b62ecbda0bf8a SHA-1: 803d7146683a3e4475cae2cbc73e35b3e9e20d21 SHA-256: 875f82d57e203781d0f6d74fcff4041d04daeea016f658af21907301cd28e1f6
126 Risk Score

Malware Insights

MITRE ATT&CK
T1059.001 PowerShell

The PDF file contains XFA forms with risky executable scripts, indicated by high-severity heuristic firings. It also utilizes PDF unescape functions and String.fromCharCode, suggesting obfuscation to hide malicious code. An embedded file artifact was also extracted. The combination of these factors points to an attempt to exploit PDF viewer vulnerabilities, likely to download and execute a secondary payload.

Heuristics 8

  • 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
  • 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.
  • 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
dd1159df0f1ddb7acda97f13e114f181b79f1eb680361992067e5978dbcd223c		 pdf-embedded-file PDF EmbeddedFile object 8 at offset 0xC6 26053 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 2 eval/decoder/string-building token(s).

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