Malicious PDF — malware analysis report

Static analysis result for SHA-256 e9936153ffbd16a7…

MALICIOUS

PDF

10.5 KB Authoring application: Hrjumaasb Fqgyblbl
MD5: bf622d13ea2cc2c034f8828ecb003a9f SHA-1: 60e2a93ad260a643487e2c64fe11d4f1ee31576c SHA-256: e9936153ffbd16a77eb1a6eb10d61159eb4bdef11a8f34eb3706d7171e2066d4
68 Risk Score

Malware Insights

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

The PDF file contains an embedded script payload and an embedded file, both flagged as suspicious. The ML classifier strongly indicates maliciousness. The embedded file, 'embedded_file_obj0008.bin', is likely the second-stage payload. No specific family could be identified, but the attack pattern suggests exploitation of a PDF viewer vulnerability to deliver a 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
eba74df4f2f7693d9c437f99f588c0358985d79f4b03ec820fb40c6a76c07644		 pdf-embedded-file PDF EmbeddedFile object 8 at offset 0x28B 9674 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 1 long base64-like blob(s).

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