Malicious PDF — malware analysis report

Static analysis result for SHA-256 afd9e362a02fac0c…

MALICIOUS

PDF

522.8 KB Created: 2010-11-11 11:35:07 +08:00
MD5: 8e7d5b891fee56d4cb31fcc382b5e272 SHA-1: 6d64bf7a560301c812592288d4f6c3860cfa99b1 SHA-256: afd9e362a02fac0cc68ccbd750d93587c9d00bb9cd386c36033debd1c5008b96
128 Risk Score

Malware Insights

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

The PDF file exhibits multiple suspicious findings, including embedded JavaScript, an embedded Flash file (SWF), and a secondary embedded PDF. The presence of these elements, particularly the Flash content and JavaScript stream, strongly suggests an attempt to exploit vulnerabilities or execute malicious code. The polyglot nature of the file, containing a PDF within a PDF, further indicates a complex delivery mechanism. The embedded artifacts like 'jit-spray.swf' and '2.swf' are likely components of the exploit or payload.

Heuristics 8

  • Secondary embedded PDF body has suspicious static findings critical POLYGLOT_CHILD_PDF_STATIC_TRIAGE
    A valid PDF body was found at a nonzero offset inside another container and its carved contents matched PDF exploit or lure heuristics. This catches polyglots where the top-level magic routes to ZIP/OLE while a PDF reader or downstream parser opens the hidden PDF payload.
  • RichMedia (Flash) high PDF_RICHMEDIA
    PDF contains /RichMedia (Adobe Flash) which is a historic exploit vector (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.
  • Embedded file low PDF_EMBEDDED
    PDF embeds a file attachment — could carry an executable or another weaponised document as a nested payload
  • PDF paints image(s) but contains no text operators info PDF_IMAGE_ONLY_LURE
    PDF has 2 image XObject(s) and the content stream contains no text-emitting operators (BT/ET, Tj, TJ, ', ") in either raw bytes or decompressed streams — this is the screenshot-as-PDF pattern used to bypass text-based scanners and to deliver instructions purely through rendered pixels. It is informational unless paired with invisible links or risky URI context.
  • 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/xap/1.0/
    • http://ns.adobe.com/pdf/1.3/
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/pdfx/1.3/

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
jit-spray.swf
747b7f4f4534d1274364f133076e3209cee76abedfd72c62b46cd7ff51f8b182		 pdf-embedded-file PDF EmbeddedFile object 42 at offset 0x1C9F 367 bytes
2.swf
b55100fe187899aa5adb8ec02aedaabcb4f360d3141ff373afe54e82df188398		 pdf-embedded-file PDF EmbeddedFile object 46 at offset 0x1F88 22946 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact entropy is 7.98, consistent with packed or encrypted content.
javascript_obj0052_000.js
307fdec7aac2ea7b48e6b9675aae2deed746f5c7d0ca2ac3cb56aa265bb85ec0		 pdf-javascript-stream PDF /JS object 52 at offset 0x7E86 53986 bytes
objstm_0059_00.bin
29b23a93afdfdac79a4ed4739cc45ccaf113ada996b6e6a5305ed991f5a93de7		 pdf-objstm-decoded PDF /ObjStm 59 0 obj (inflated) 453 bytes
polyglot_child_pdf_off000783d5.pdf
815ba6fc9a68b9b7c87b1502a64d8747d0dd74b968377a17f478122d63172566		 polyglot-child-pdf Secondary PDF body inside pdf container at offset 0x783D5 42799 bytes

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