Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c72d74ea6079029…

MALICIOUS

PDF

29.2 KB Created: 2013-02-04 13:49:43 Authoring application: BVueMyGp (via XWbt14Wq2SGq8) First seen: 2026-05-09
MD5: a1788185d881b66991cd2f5c60e0ca4d SHA-1: 72424fbb62783430b8d69c01ddace364cea3f7a0 SHA-256: 8c72d74ea6079029156f62accf7370a0c36bf4c1f342339c2fc51fa8b704b42d
72 Risk Score

Malware Insights

MITRE ATT&CK
T1555 Credentials from Password Stores T1027 Obfuscated Files or Information T1140 Deobfuscate/Decode Files or Information

The PDF was flagged by an ML classifier as malicious. It contains an embedded file, which is a common technique for delivering secondary payloads. The XFA form and embedded file heuristics further support this. The exact nature of the embedded file could not be determined due to its size and lack of further analysis.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9094

Heuristics 6

  • Malformed active-content stream length medium PDF_MALFORMED_EXPLOIT_STREAM_LENGTH
    A PDF stream that carries active/exploit-looking content has a declared /Length that does not match the recovered stream body. Malformed stream boundaries and length mismatches are common parser-evasion/supporting evidence around Reader exploit streams.
  • 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
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • 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/ In PDF document text
    • http://www.xfa.org/schema/xci/1.0/In PDF document text
    • http://www.xfa.org/schema/xfa-template/2.2/In PDF document text
    • http://www.xfa.org/schema/xfa-data/1.0/In PDF document text
    • http://ns.adobe.com/xfdf/In PDF document text
    • http://www.xfa.org/schema/xfa-form/2.8/In PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
embedded_file_obj0016.bin pdf-embedded-file PDF EmbeddedFile object 16 at offset 0x176A 28171 bytes
SHA-256: 3dc28ed4e4a4e43f36fd32d78703fa8a8b53f1fe53601b527f97ee60ffcee5cd
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 1 long base64-like blob(s).
stream_018_off000056aa.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x56AA 120 bytes
SHA-256: 8028c643df4e264224bbf458f3d784a956b1606e3ec50ae4c1280f74a3ecec09

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