Malicious PDF — malware analysis report

Static analysis result for SHA-256 8d35036412af0ce2…

MALICIOUS

PDF

39.9 KB Created: 2012-12-17 16:05:19 Authoring application: ameuqjcms (via shtqdthq) First seen: 2026-05-07
MD5: 0187c8aa7b1bacefa447ba3ec488d62f SHA-1: f9809c3cc3878045f26e009a9d51c18728edc94b SHA-256: 8d35036412af0ce24faf5c6b59664dc9d416de607968ba71ccdacb834afd3a6c
72 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious File

The ML classifier strongly indicates maliciousness in this PDF document. The presence of an embedded file and XFA form further supports this assessment. While no specific document body content or scripts were available for analysis, the overall structure and heuristic firings suggest the PDF is designed to exploit a vulnerability and deliver a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9619

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

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
embedded_file_obj0016.bin pdf-embedded-file PDF EmbeddedFile object 16 at offset 0x17E9 7076 bytes
SHA-256: a3e490b4dcf23cb3d6b7149b0221fd2e3882b332f9f1601f9ead01d00c872680
Detection
ClamAV: No threats found
Obfuscation or payload: likely
99 of 198 identifiers look randomly generated (e.g. 'DqmhhrsG0BKIAgEAx') — consistent with name-mangling obfuscation.

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