Malicious PDF — malware analysis report

Static analysis result for SHA-256 1d82801d7f14ae09…

MALICIOUS

PDF

16.5 KB
MD5: a9c7c91061bcdb739180c1e04f7837cc SHA-1: e995ac7380e65281318eafaf0eea7ddd55869bd4 SHA-256: 1d82801d7f14ae0942a6a3390c156f0d7d1d9a97044f2e79ec3cd15ad0968b79
148 Risk Score

Malware Insights

MITRE ATT&CK
T1204.002 Malicious File T1059.007 JavaScript

The PDF sample contains high-severity heuristics indicating the presence of risky executable scripts within XFA forms and the use of unescape functions, suggesting an attempt to exploit PDF viewer vulnerabilities. An embedded file was also detected. The ML classifier strongly flagged this PDF as malicious. The embedded URLs are related to Adobe XFA, which is often targeted for exploitation.

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
6b2b7300a443e93d6019815b1ff6edf79b5cfb15486d26e53e862117dc1a9d66		 pdf-embedded-file PDF EmbeddedFile object 8 at offset 0xC6 16132 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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