Malicious PDF — malware analysis report

Static analysis result for SHA-256 c569821f2ef35ae4…

MALICIOUS

PDF

1.51 MB Created: 2009-04-22 14:33:48 +08:00 Authoring application: Acrobat PDFMaker 7.0 for Word (via Acrobat Distiller 7.0 (Windows))
MD5: 3c00f6663e58e53551971b99fcdc1bc9 SHA-1: 87b8f099fff36a3a8ae2bb43f3605b93242102e6 SHA-256: c569821f2ef35ae481b7e9e5944403b9c87436bd0c09d13c62d956c1e5ba4692
94 Risk Score

Malware Insights

MITRE ATT&CK
T1059.001 PowerShell

This PDF file exhibits malicious characteristics, including embedded JavaScript with obfuscation indicators. The ML classifier strongly flagged it as malicious. The JavaScript action and embedded JS stream suggest the file is designed to execute arbitrary code, likely downloading and running a second-stage payload. The specific obfuscation techniques used in the JavaScript prevent a more detailed analysis of its exact function.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9939

Heuristics 7

  • unescape() call high PDF_UNESCAPE
    unescape() found — often used to decode shellcode in PDF JS exploits (matched inside decoded stream)
  • JavaScript action low PDF_JAVASCRIPT
    PDF contains a /JavaScript action. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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.
  • PDF differential parser failed info PDF_DIFFERENTIAL_PARSE_FAILED
    The cross-check parser (pdfminer.six) failed on this file: PDF differential parser failed: PermissionError. Static heuristics still ran and any of their findings above are valid; only the differential cross-check signal is missing.
  • 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://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/pdfx/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/photoshop/1.0/

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
javascript_obj0027_000.js
fbc9bc5a136655029641323fd29b746fd34be9d09c1ba77f2395a7783bef94aa		 pdf-javascript-stream PDF /JS object 27 at offset 0x180B7F 4070 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 6 eval/decoder/string-building token(s).

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