Malicious PDF — malware analysis report

Static analysis result for SHA-256 7f51388ad577adad…

MALICIOUS

PDF

4.8 KB Created: 2011-04-05 23:46:28 Authoring application: bufdfob First seen: 2026-05-08
MD5: 855bb618585db5e71a03ab780af58411 SHA-1: 83074de99f2a3c8af35d34827be1e25010cac5d5 SHA-256: 7f51388ad577adad683247e1034babe221db83c85d5d7890ad9bba67932b97eb
72 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file contains embedded content and triggers heuristics related to malicious PDFs, including ML classification. The presence of an embedded JavaScript stream suggests an attempt to execute malicious code, likely to download and execute a second-stage payload. While the URLs extracted are benign, the overall structure and heuristic firings indicate a malicious intent, possibly related to exploiting PDF vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 6

  • PDF embedded file could not be fully decoded medium PDF_EMBEDDED_FILE_UNDECODED
    A declared PDF /EmbeddedFile stream uses filters that the scanner could not decode. The raw stream was carved for artifact triage because malformed or unsupported attachment filters can hide payload content from normal extraction.
  • 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
  • Embedded script payload in PDF stream info PDF_EMBEDDED_SCRIPT_PAYLOAD
    PDF stream bytes contain an HTML/XFA <script> tag without accompanying Windows shell-execution primitives — common in accessible XFA forms but worth surfacing for analyst review.
  • 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.
  • 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/xfa-template/2.5/In PDF document text
    • http://www.xfa.org/schema/xfa-data/1.0/In PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_001_off00000309.js decompressed-pdf-stream PDF FlateDecoded stream at offset 0x309 13223 bytes
SHA-256: 94ccb1ff938761ae5ff150bdea5d320ab086c298d118db9acdeae0736754b072

Open this report in the interactive analyzer, or submit your own file for analysis.