Malicious PDF — malware analysis report

Static analysis result for SHA-256 834b93e042599926…

MALICIOUS

PDF

12.0 KB
MD5: 5df6972bbbf04e5e3b8207ae8ec9c455 SHA-1: 9eed839d3e6c80b3d503809945dac69ae2b7296b SHA-256: 834b93e0425999267f1d3e1c99f26faf4b7be2fd1b63fa2d0390dc924203721d
130 Risk Score

Malware Insights

MITRE ATT&CK
T1203 Exploitation for Client Execution T1566.001 Spearphishing Attachment

The PDF file contains embedded content and uses ASCIIHexDecode filters, indicating an attempt to obfuscate malicious code. The ML classifier and ClamAV detection strongly suggest malicious intent, likely involving exploitation for client execution. The embedded URL is highly suspicious and is presumed to be the source of a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 6

  • ClamAV: Pdf.Exploit.Dropped-90 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Exploit.Dropped-90
  • ASCIIHexDecode filter (with exploit indicators) medium PDF_FILTER_HEX
    Hex-encoding filter present alongside exploit delivery indicators — often used to hide payload or shellcode bytes
  • 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
  • PDF differential parser failed info PDF_DIFFERENTIAL_PARSE_FAILED
    The cross-check parser (pdfminer.six) failed on this file: PDF differential parser failed: PSSyntaxError. Static heuristics still ran and any of their findings above are valid; only the differential cross-check signal is missing.
  • 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://lcker.ru/ItuBF21PNxyDGU84axtoFdbr84x4Dmbc?pp=1?plugin=1
    • http://ns.adobe.com/xdp/
    • http://www.xfa.org/schema/xci/1.0/
    • http://www.xfa.org/schema/xfa-template/2.4/
    • http://www.xfa.org/schema/xfa-data/1.0/
    • http://ns.adobe.com/xtd/
    • http://www.xfa.org/schema/xfa-form/2.8/

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
embedded_file_obj0001.bin
d7ed1b165f180d1073eb3babb49fbddd6d7017beccb7c08934acbca98b21aca4		 pdf-embedded-file PDF EmbeddedFile object 1 at offset 0x5A 1874 bytes

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