PDF malware analysis — malicious · 8b821297ce83d927

MALICIOUS

PDF

197.0 KB Created: 2010-03-30 20:51:31 +08:00 Authoring application: pdfFactory Pro www.pdffactory.com (via pdfFactory Pro 3.37 (Windows XP Professional Chinese))

MD5: d7520d1957d5ef26e068727fac4c4f02 SHA-1: be2cdd5b74d68223edfc226d7c2d4c70f63cc447 SHA-256: 8b821297ce83d927e3ab73fe465149beb64b67d5b2cbee1cfaa4953c84c6a302

196 Risk Score

Malware Insights

MITRE ATT&CK

T1204.002 Malicious File T1059.001 PowerShell

The PDF file contains embedded JavaScript that exploits CVE-2009-4324, a known vulnerability in Adobe Reader. The heuristic firings indicate the use of JavaScript actions and unescape functions, common in exploit delivery. The presence of a secondary embedded PDF further suggests a multi-stage attack. The primary intent appears to be the execution of malicious code via the exploit.

Heuristics 7

media.newPlayer — CVE-2009-4324 critical CVE exact CVE_2009_4324

PDF JavaScript calls media.newPlayer — CVE-2009-4324 is a use-after-free in Adobe Reader's multimedia plugin triggered by media.newPlayer(). Actively exploited as a zero-day in December 2009. (identified after JavaScript deobfuscation)
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.
unescape() call high PDF_UNESCAPE

unescape() found — often used to decode shellcode in PDF JS exploits (matched inside decoded stream)
Suspicious extracted artifact medium 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.
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 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 7

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`stream_004_off0000063a.js` `ec2119df85e590d390c6b4323644e3f0acd58e50313801d0b5eb1957b7e45332`	decompressed-pdf-stream	PDF FlateDecoded stream at offset 0x63A	2660 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 3 eval/decoder/string-building token(s). Carved artifact contains 1 long hex-escaped blob(s).
`legacy_pdfkit_stage_000.js` `42c3f4df375ff6f58ff655cc4f88b5cc28f0dd33b978390db3538684a6219b74`	deobfuscated-js	string-concatenation normalized Acrobat API aliases at offset 0x63A	126 bytes
`objstm_0023_00.bin` `e8bfe65c34a535b0837ce7c541e45b42ab61e1ff13de05788daf7770f9a1ec0e`	pdf-objstm-decoded	PDF /ObjStm 23 0 obj (inflated)	274 bytes
`font_00_sfnt_off0000d490.bin` `3bac5c0281a2cd2e8671f67d81986280e434f05dfdcf35f70783c2b447147f73`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xD490	9384 bytes
`font_01_sfnt_off0000f508.bin` `e6230e66eb2d32353b3645d6fadb85aad2e592d0cd480dc2c50e789e45fd2002`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF508	7252 bytes
`polyglot_child_pdf_off000093fb.pdf` `7c341f30fdb8606ea0954ee8d827e10efaffc6da96061b9547652e0ee9b6f033`	polyglot-child-pdf	Secondary PDF body inside pdf container at offset 0x93FB	163894 bytes
`polyglot_child_pdf_off0002fc44.pdf` `0b1c923c8a0028794f3a3244dc498786746334f394e41678cc58ffbeb707d0a8`	polyglot-child-pdf	Secondary PDF body inside pdf container at offset 0x2FC44	6125 bytes

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