Malicious PDF — malware analysis report

Static analysis result for SHA-256 6102c014cb17d2d4…

MALICIOUS

PDF

5.8 KB
MD5: c6e6a7bdfe6d65125f9877c9f483ba5f SHA-1: 59bb5fc37176991114ce677ebbbd831578021108 SHA-256: 6102c014cb17d2d4b1af74b095d9418171a9ec852fe27bee024dd2bec7403770
138 Risk Score

Malware Insights

MITRE ATT&CK
T1203 Exploitation for Client Execution T1059.007 JavaScript

The sample is a PDF file exhibiting multiple indicators of maliciousness, including PDF_FILTER_HEX with exploit indicators and a high ML score. ClamAV also detected it as Heuristics.PDF.ObfuscatedNameObject. The presence of XFA forms and embedded files suggests an attempt to execute code, likely leveraging a vulnerability for client execution. While specific URLs were extracted, they are confirmed benign, and no scripts were directly readable, leading to an unknown family classification.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9484

Heuristics 7

  • ClamAV: Heuristics.PDF.ObfuscatedNameObject critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Heuristics.PDF.ObfuscatedNameObject
  • 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
  • AcroForm button with action trigger low PDF_ACROFORM_BUTTON
    PDF contains a /Btn form field together with a SubmitForm/URI/Launch/JS trigger — this is the building block of fake 'Download' or 'Open' button overlays used in PDF phishing lures
  • 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://www.xfa.org/schema/xfa-template/2.4/
    • http://ns.adobe.com/xdp/
    • http://www.xfa.org/schema/xci/1.0/
    • http://www.xfa.org/schema/xfa-data/1.0/

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
embedded_file_obj0010.bin
dc5c6d85a316954e6131ea30bf4ce856624b8b2a795f2085a6040c3fd2bdb5bc		 pdf-embedded-file PDF EmbeddedFile object 10 at offset 0x1FC 1483 bytes
embedded_file_obj0011.bin
47bc1a235297650a3fd70afa9ed0b8095feebffeb3ca174b375369b74d1bd8c4		 pdf-embedded-file PDF EmbeddedFile object 11 at offset 0x108B 869 bytes
stream_001_off00000e18.bin
8af81ed8eb133b8dbc92f16ee731a72b4418c73f308df25baea192d921e616d2		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0xE18 256 bytes
stream_003_off0000142a.bin
422a5430698c54d7acba092e1350d18143964b54c5496415f1d8f31cbbcf0663		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x142A 332 bytes

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