Malicious PDF — malware analysis report

Static analysis result for SHA-256 eb675626046ec911…

MALICIOUS

PDF

4.9 KB Created: 2011-04-05 23:46:28 Authoring application: bufdb lsdfob First seen: 2013-09-29
MD5: 6b6e3bf7a0561fbea38dd1597f145c56 SHA-1: f67d9f07b9dccc1b3316eccb5f2a22015979af3c SHA-256: eb675626046ec91109d2556af5cce4152ffeefcfd6b162e888ae05580f09b009
74 Risk Score

Malware Insights

MITRE ATT&CK
T1059.001 PowerShell T1204.002 Malicious File

The PDF file was flagged for containing an embedded script payload. Static triage identified this as a JavaScript file with obfuscation indicators. The embedded JavaScript is the primary indicator of malicious intent, likely serving as a downloader or initial execution vector for further malicious activity. The PDF structure itself also shows signs of potential exploitation with XFA forms and embedded files.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 7

  • 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.
  • 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/xfa-template/2.5/In PDF document text
    • http://www.xfa.org/schema/xfa-data/1.0/In PDF document text

Related samples 8

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

Full JSON: related samples API

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_001_off0000031f.js decompressed-pdf-stream PDF FlateDecoded stream at offset 0x31F 13253 bytes
SHA-256: dcf1ed21fe7c72e1e5b472470f1f08927338b410c81321f48d7ebd1ab58d3ea4
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 1 eval/decoder/string-building token(s).

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