Malicious PDF — malware analysis report

Static analysis result for SHA-256 85fac31937f9aa39…

MALICIOUS

PDF

4.1 KB
MD5: 7e6030e78a812ae6a5df2a484f8a661f SHA-1: 67cf7dfa96da472ae50c0cb0130b1bf8d77497d3 SHA-256: 85fac31937f9aa39e9a1514b012a43643735cb3d421407bd517b2e493658965f
132 Risk Score

Malware Insights

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

The sample is a PDF file that triggers a critical heuristic for CVE-2010-0188, an Adobe Reader exploit targeting LibTIFF XFA images. This indicates the file is designed to exploit a known vulnerability for client-side execution. The ML classifier also strongly flags this PDF as malicious. No document body text or scripts were extracted, but the presence of an embedded exploit payload is sufficient evidence of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

Heuristics 7

  • Adobe Reader LibTIFF XFA image exploit — CVE-2010-0188 critical CVE likely CVE_2010_0188
    PDF contains XFA image data with an inline crafted TIFF payload and shellcode/delivery markers. This is the data-bound variant of the CVE-2010-0188 Adobe Reader LibTIFF/XFA exploit shape.
  • 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: PSEOF. Static heuristics still ran and any of their findings above are valid; only the differential cross-check signal is missing.
  • 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/xtd/
    • http://www.xfa.org/schema/xfa-form/2.8/
    • 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/

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
embedded_file_obj0001.bin
da5410d887c886d797f64cdacee492f0c53bed34a6468b7d60ec459053b93a9d		 pdf-embedded-file PDF EmbeddedFile object 1 at offset 0x6A 12327 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 1 long base64-like blob(s).
embedded_file_obj0010.bin
8af81ed8eb133b8dbc92f16ee731a72b4418c73f308df25baea192d921e616d2		 pdf-embedded-file PDF EmbeddedFile object 10 at offset 0x8F6 256 bytes
embedded_file_obj0011.bin
e8dd7ec282dcc41393e53ae5e22b115c39a23561ca55dd168d2c10c574a88384		 pdf-embedded-file PDF EmbeddedFile object 11 at offset 0xB54 779 bytes
embedded_file_obj0012.bin
422a5430698c54d7acba092e1350d18143964b54c5496415f1d8f31cbbcf0663		 pdf-embedded-file PDF EmbeddedFile object 12 at offset 0xD60 332 bytes

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