PDF malware analysis — malicious · e8d4eac02f12eed0

MALICIOUS

PDF

189.8 KB Created: 2010-06-11 11:09:09 +08:00 Authoring application: Writer (via OpenOffice.org 3.0)

MD5: 45f8ce0c684bf3c0cbe1a5dc138d9cfa SHA-1: cbac6a9f7c5d0b7810fe36a3655c5eaa2dab89f1 SHA-256: e8d4eac02f12eed015c3dba5a4d8f7803e99048119db09853de3da16c29fcd31

166 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 JavaScript T1204.002 Malicious File

The PDF contains embedded JavaScript and RichMedia (Flash) content, indicated by multiple heuristic firings. A critical finding reveals a secondary embedded PDF with suspicious static findings, suggesting a multi-stage attack. The primary PDF likely uses its embedded scripts to trigger the execution of the secondary PDF, which is the main malicious component.

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)
unescape() call high PDF_UNESCAPE

unescape() found — often used to decode shellcode in PDF JS exploits (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. (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)
Embedded file low PDF_EMBEDDED

PDF embeds a file attachment — could carry an executable or another weaponised document as a nested payload (matched inside decoded stream)
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://purl.org/dc/elements/1.1/
- http://ns.adobe.com/xap/1.0/mm/
- http://ns.adobe.com/pdf/1.3/

Extracted artifacts 6

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`stream_002_off00000372.bin` `2936a4096ca7319fc3e4a9c2fdbb6ab1cf4957e76d5d4f8f3a49f2c22fbe8ac4`	decompressed-pdf-stream	PDF FlateDecoded stream at offset 0x372	3386 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s).
`objstm_0015_00.bin` `cbd11d2ce487f41cb2e696adc35306d2f3d38b7de6eab25b0e0d07f05d693f12`	pdf-objstm-decoded	PDF /ObjStm 15 0 obj (inflated)	912 bytes
`font_00_sfnt_off000244b1.bin` `e435da29fd7d7dfdac574fafaf97bb17bd7eef224fbcab2a574ab0c722da6873`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x244B1	32860 bytes
`font_01_sfnt_off00028e80.bin` `85a1f294195490f332cb03f1c440ed59b5a59956ccfaea3c1ccfb5bbe710c619`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x28E80	31336 bytes
`polyglot_child_pdf_off00017bab.pdf` `c02a5f3d4eaf19c00196609828847ad8cf99b74986a313fb70f48f61117cc46e`	polyglot-child-pdf	Secondary PDF body inside pdf container at offset 0x17BAB	97184 bytes
`polyglot_child_pdf_off0002df5e.pdf` `0b1c923c8a0028794f3a3244dc498786746334f394e41678cc58ffbeb707d0a8`	polyglot-child-pdf	Secondary PDF body inside pdf container at offset 0x2DF5E	6125 bytes

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