Malicious PDF — malware analysis report

Static analysis result for SHA-256 abbd1c6f45fa7ff6…

MALICIOUS

PDF

62.9 KB
MD5: bbf06ebd0fe7c596629d074925f53a2d SHA-1: 0c1840fe415b3975844592442eb2a341c7f54230 SHA-256: abbd1c6f45fa7ff6608cad5a1e4025f8028afc61192cd8be203e3c4b14cf624b
148 Risk Score

Malware Insights

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

The PDF sample contains high-severity heuristics indicating embedded script payloads and XFA forms with risky executable scripts. The ML classifier strongly flagged this PDF as malicious. The presence of an embedded file and the use of unescape() suggest an attempt to deliver and execute a secondary payload. The embedded file 'embedded_file_obj0008.bin' is a primary indicator of compromise.

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
37eef75d594a3b32c8cf4bad930377d22d6ac7191026b60d566b3781778a7dfb		 pdf-embedded-file PDF EmbeddedFile object 8 at offset 0xC6 63673 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 1 eval/decoder/string-building token(s).

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