Malicious PDF — malware analysis report

Static analysis result for SHA-256 97ab0a6f2af8fe05…

MALICIOUS

PDF

244.1 KB Created: 2011-04-25 22:48:14 +08:00 Authoring application: WPS Office 个人版 (via PDFlib 7.0.3 (C++/Win32))
MD5: b56c86f3605c5c2184e55b8521257965 SHA-1: 44f09ace41d98bdfc550fae819de0941d36fd207 SHA-256: 97ab0a6f2af8fe0581af695626252b20725b3dac1065c2ad061d48d616d59c58
222 Risk Score

Malware Insights

MITRE ATT&CK
T1204 Malicious Link T1204.002 Malicious Link: Malicious File T1059 Command and Scripting Interpreter

The PDF sample was flagged by multiple critical heuristics, including ClamAV detection as 'Pdf.Exploit.Agent-30317' and a ML classifier indicating high maliciousness. The presence of embedded JavaScript and RichMedia (Flash) suggests an attempt to exploit vulnerabilities within the PDF reader. The 'POLYGLOT_CHILD_PDF_STATIC_TRIAGE' heuristic indicates a secondary embedded PDF with suspicious findings, further supporting the exploit delivery mechanism. The primary purpose appears to be the execution of a malicious payload, likely downloaded from an external source, although no specific URLs for this download were extracted.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9929

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.
  • ClamAV: Pdf.Exploit.Agent-30317 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Exploit.Agent-30317
  • RichMedia (Flash) high PDF_RICHMEDIA
    PDF contains /RichMedia (Adobe Flash) which is a historic exploit vector (matched inside decoded stream)
  • Embedded file low PDF_EMBEDDED
    PDF embeds a file attachment — could carry an executable or another weaponised document as a nested payload
  • 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. (matched inside decoded stream)
  • 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. (matched inside decoded stream)
  • XFA form low PDF_XFA
    PDF uses XML Forms Architecture — can contain script logic (matched inside decoded stream)
  • 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://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/pdf/1.3/

Extracted artifacts 14

Files carved from inside the sample during analysis.

FilenameKindSourceSize
embedded_file_obj0001.bin
2bbe69c5e9b01e09ead01d39980623115955d79663f86ee38c3e26d62468aede		 pdf-embedded-file PDF EmbeddedFile object 1 at offset 0x380F 163 bytes
embedded_file_obj0002.bin
2db2fcfa6c7f0b58af35cd0b7a546eab3e22594fa9e6a322d8448248c1371742		 pdf-embedded-file PDF EmbeddedFile object 2 at offset 0x38FF 1683 bytes
embedded_file_obj0003.bin
6824595d40fe37ff3a17665623abb424df29f2bf3924106e83b1192a2fc6fa0d		 pdf-embedded-file PDF EmbeddedFile object 3 at offset 0x3C21 784 bytes
embedded_file_obj0004.bin
720c47f19e6a058099295d18a16b7149cc73fe497eb78821ea810f3192228dc4		 pdf-embedded-file PDF EmbeddedFile object 4 at offset 0x3E15 150 bytes
embedded_file_obj0005.bin
c8a82f67dfd8d68c2f8fe494ca2deee4604701c8f02863bf87d222b992e45de9		 pdf-embedded-file PDF EmbeddedFile object 5 at offset 0x3EE6 2955 bytes
embedded_file_obj0006.bin
4cb349134bdb5f1a1c03281df9b53128ebe947f235398a912a4f0a9f638b24d5		 pdf-embedded-file PDF EmbeddedFile object 6 at offset 0x4260 200 bytes
embedded_file_obj0007.bin
41b90835819d2fc9adfbed1f624b97daf557be436627d29ad24fdfcbedc74198		 pdf-embedded-file PDF EmbeddedFile object 7 at offset 0x4353 835 bytes
embedded_file_obj0008.bin
4a60a9864cdf7382475d51051a03fdc43b32c31eb508893ccfccece34957f9f1		 pdf-embedded-file PDF EmbeddedFile object 8 at offset 0x452B 56 bytes
stream_002_off000003d6.js
529357503ec67b623d2a12816cdeea62bd639f2b4ff4e568b01c96cc3f5bfc6f		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x3D6 1363 bytes
stream_003_off000005b3.js
e985b5df65c8c3cf732a9074b575fbc594c1c7f0bccc0994182ec7e5c0f7308a		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x5B3 902 bytes
objstm_0041_00.bin
cc0d110077f81314ac59a491675430d25faa86bdc2526ed35971cf361ac83464		 pdf-objstm-decoded PDF /ObjStm 41 0 obj (inflated) 1575 bytes
font_00_sfnt_off0000e8f5.bin
d7299fcfec9332d4924de7e726980b6ae8b4db53b1693e5249183e00fdb3c14f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE8F5 264980 bytes
polyglot_child_pdf_off0000c71d.pdf
1012062156c3addb55313b8a5df187954299a555f6c56f64091c74361a2731a0		 polyglot-child-pdf Secondary PDF body inside pdf container at offset 0xC71D 198940 bytes
polyglot_child_pdf_off0003b84c.pdf
0b1c923c8a0028794f3a3244dc498786746334f394e41678cc58ffbeb707d0a8		 polyglot-child-pdf Secondary PDF body inside pdf container at offset 0x3B84C 6125 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.