Malicious PDF — malware analysis report

Static analysis result for SHA-256 9a133a7e4d780505…

MALICIOUS

PDF

10.1 KB Authoring application: Lrvwxdervrsdvpdl Vohruyksicddo
MD5: 1edc57c86de3585df919b6340863533c SHA-1: 4f5fc09645c833f01eddb6845d3e6a6cac37370e SHA-256: 9a133a7e4d780505f3f4e3bae4b8db0afa341dc886970720f628bcbdbe2d23a7
68 Risk Score

Malware Insights

MITRE ATT&CK
T1204.002 Malicious File T1566.001 Spearphishing Attachment

The PDF file contains an embedded script payload, indicated by the 'PDF_EMBEDDED_SCRIPT_PAYLOAD' heuristic. The ML classifier strongly flagged this PDF as malicious. The embedded file 'embedded_file_obj0008.bin' is suspicious and likely contains the secondary payload. The document body contains obfuscated JavaScript, which is likely responsible for executing the embedded payload.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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/xci/1.0/
    • http://www.xfa.org/schema/xfa-template/2.5/
    • 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_file_obj0008.bin
677006433660c9628bc54790e70189f20c1162c9c9d88e4c7efd79d1bc13ae57		 pdf-embedded-file PDF EmbeddedFile object 8 at offset 0x1FB 9274 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 1 long base64-like blob(s).

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