Malicious PDF — malware analysis report

Static analysis result for SHA-256 df5b3f695c9224cb…

MALICIOUS

PDF

69.9 KB
MD5: 5837c660da6e7c1922c0ee8376367752 SHA-1: e448ae32b49e4bcdf780300bf273ba850aa6caae SHA-256: df5b3f695c9224cb1429822e42d798da46e83bd5f79dfe5efb8e4b4715e36003
76 Risk Score

Malware Insights

MITRE ATT&CK
T1059.001 PowerShell T1566.001 Spearphishing Attachment

The PDF file contains embedded JavaScript, indicated by the PDF_JAVASCRIPT and PDF_JS heuristics. ClamAV also flagged it as Heuristics.PDF.ObfuscatedNameObject, suggesting malicious intent. The embedded JavaScript stream is likely responsible for downloading and executing a second-stage payload from the unknown reputation URL http://www.bitstream.com. The document body is heavily obfuscated and does not provide clear user-facing content.

Heuristics 4

  • ClamAV: Heuristics.PDF.ObfuscatedNameObject critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Heuristics.PDF.ObfuscatedNameObject
  • 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.
  • 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.bitstream.com

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
javascript_obj0012_000.js
6655b56d39344fc7fe6d32dc6499a7fe5afd9a301eb45982df339a689ccc4e9e		 pdf-javascript-stream PDF /JS object 12 at offset 0x1060C 3887 bytes

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