Malicious PDF — malware analysis report

Static analysis result for SHA-256 ba5f0d5065c3f637…

MALICIOUS

PDF

224.6 KB Created: 2010-06-11 15:34:24 +08:00
MD5: 731835c6b88c48ba7de4339825009e2e SHA-1: cba3892b9af12c4ab1d90df55fff0c2f74d1ff86 SHA-256: ba5f0d5065c3f637d1cb1539850016a1f8fcd3de0c1def0e66e53baf15c6924b
248 Risk Score

Malware Insights

MITRE ATT&CK
T1204.002 Malicious File

This PDF file has been identified as malicious by ClamAV (Pdf.Exploit.Agent-35955). It contains embedded JavaScript and a Flash object (AES-PHP.swf), indicating an attempt to exploit vulnerabilities. The presence of these embedded components suggests the PDF is designed to download and execute a secondary payload.

Heuristics 10

  • 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.
  • ClamAV: Pdf.Exploit.Agent-35955 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Exploit.Agent-35955
  • ClamAV detection on extracted artifact critical EXTRACTED_FILE_CLAMAV
    ClamAV flagged at least one file extracted from inside this sample. Even when the wrapping document carries no AV detection of its own, a hit on the carved artifact is a strong indicator the sample is a delivery vehicle.
  • 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/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/xap/1.0/mm/

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
AES-PHP.swf
3717e671d23c561cfd9c7f930f85e60340a08899311807a62139d7a8326708f9		 pdf-embedded-file PDF EmbeddedFile object 31 at offset 0x17FD 27313 bytes
Detection
ClamAV: Pdf.Exploit.Agent-35955
Obfuscation or payload: likely
Carved artifact entropy is 7.99, consistent with packed or encrypted content.
javascript_obj0039_000.js
a7b7d9f122fb4ba1a43217c39e2f32d09fdb8c8df0af8200c825cae7e0315993		 pdf-javascript-stream PDF /JS object 39 at offset 0x889F 40884 bytes
objstm_0045_00.bin
d8c7b61038fd49faf55e6884815ed621f8c669b068e77aeeb41693dbc7c0e321		 pdf-objstm-decoded PDF /ObjStm 45 0 obj (inflated) 455 bytes
polyglot_child_pdf_off0002d9e8.pdf
73b5c2297d54ff4e7fe340e2f94c9cad65ef470766eea082d937c8597a7e0e7f		 polyglot-child-pdf Secondary PDF body inside pdf container at offset 0x2D9E8 43181 bytes
Detection
ClamAV: Pdf.Exploit.Agent-35955
Obfuscation or payload: unlikely

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