Malicious PDF — malware analysis report

Static analysis result for SHA-256 787f98483faedad9…

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: 0aa06074b0fff7149cc503ac80c4dd18 SHA-1: 09a34fca990769e2087f8ea435f9c5e8e6dfddb6 SHA-256: 787f98483faedad9ee853b6da7bd1960d751443587e9c30c84851a60cfca26d3
226 Risk Score

Malware Insights

MITRE ATT&CK
T1059.007 JavaScript T1203 Exploitation for Client Execution T1566.001 Spearphishing Attachment

The sample is a PDF file exhibiting critical heuristics for JavaScript exploits, specifically targeting XFA forms. It also contains embedded files and a RichMedia (Flash) object, suggesting a multi-stage attack. The presence of a JavaScript exploit cluster and embedded files strongly indicates the document is designed to download and execute a secondary payload, likely leveraging the embedded URL for this purpose. The ML classifier also flagged this PDF with high confidence.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9927

Heuristics 9

  • PDF JavaScript exploit cluster critical PDF_JS_EXPLOIT_CLUSTER
    PDF combines an executable JavaScript/action surface with exploit staging indicators such as eval/unescape/fromCharCode, XFA script content, or a related CVE pattern. Benign form JavaScript remains low-severity, but this correlated cluster is high-confidence malicious behavior.
  • 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)
  • 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)
  • 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.
  • 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/
    • http://ns.adobe.com/xdp/
    • http://www.xfa.org/schema/xci/2.8/
    • http://www.xfa.org/schema/xfa-template/2.8/
    • http://www.xfa.org/schema/xfa-data/1.0/
    • http://www.xfa.org/schema/xfa-locale-set/2.7/
    • http://ns.adobe.com/xtd/
    • http://www.xfa.org/schema/xfa-form/2.8/
    • http://cgi.adobe.com/special/acrobat/update

Extracted artifacts 16

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_off0000dc60.bin
1e850fb7228d0ad55d0ff821c34ae2aecba7c83ac3535b862b310e3ef45a6a76		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDC60 32456 bytes
font_01_sfnt_off00011f78.bin
3dc637ffffcf1276f0f45901876431d9e9d7ed23bf2f314645e85e67ef4d87f3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11F78 281396 bytes
font_02_sfnt_off0001fbc1.bin
5881ca74804155bdf92ac206dec00e0d8f4caf7fb2b456193a5187fd3b65b372		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1FBC1 24636 bytes
polyglot_child_pdf_off0000c71d.pdf
8d1937b251ca553c24f0d4710f961976cdc901c7e0a6994aa986c41ccc8745c6		 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

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