PDF malware analysis — malicious · d09f6adf824da210

MALICIOUS

PDF

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

MD5: 476286db2f572300742c177161bed256 SHA-1: 74ff749a12504c9faf2c597f32ce9ba2947744eb SHA-256: d09f6adf824da2100560c17202fa6bf3f20ce5de68e80a9ee9e51f1fd087ffab

166 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1566.001 Spearphishing Attachment T1204.002 Malicious File

The PDF contains embedded JavaScript and a secondary embedded PDF, indicated by multiple heuristic firings including PDF_JAVASCRIPT, PDF_JS, PDF_EMBEDDED, PDF_RICHMEDIA, and POLYGLOT_CHILD_PDF_STATIC_TRIAGE. The presence of these elements suggests an attempt to execute malicious code or exploit vulnerabilities within the PDF reader. The unescape() call is a common obfuscation technique used in malicious JavaScript. While no specific URLs were found to be malicious, the embedded artifacts themselves are the primary indicators of malicious intent.

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 8

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`stream_002_off00000372.bin` `55f236f1c4d58c6964105739e21feda827cd42e12ec2b7a86fcd00a7fd353044`	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).
`stream_017_off0002a04d.bin` `46aeadb4257e2e4657991b724f51324220589a041ec0f066dd3375f0c30355a0`	decompressed-pdf-stream	PDF FlateDecoded stream at offset 0x2A04D	31224 bytes
`objstm_0015_00.bin` `cbd11d2ce487f41cb2e696adc35306d2f3d38b7de6eab25b0e0d07f05d693f12`	pdf-objstm-decoded	PDF /ObjStm 15 0 obj (inflated)	912 bytes
`font_00_sfnt_off0001fea2.bin` `d62e575766511e99d5a311f1cfd4cadd3a7816e5e4def0f89a1d632de2bb8184`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1FEA2	6220 bytes
`font_01_sfnt_off0002102d.bin` `287d1d92a883288786fe56b9de80e975e4f707afd44cdefa370d553af9193a4f`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x2102D	70924 bytes
`font_03_sfnt_off0002e66d.bin` `450ec3d59a56c6dff4e134c6c5b0b09c74458b20e3de0fef23d0a4e9482f2ece`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x2E66D	21100 bytes
`polyglot_child_pdf_off00017baf.pdf` `50299ff8f61479e96a598dc067cd20094fed94cd6b4c18783400786094be0ab2`	polyglot-child-pdf	Secondary PDF body inside pdf container at offset 0x17BAF	110905 bytes
`polyglot_child_pdf_off000314fb.pdf` `0b1c923c8a0028794f3a3244dc498786746334f394e41678cc58ffbeb707d0a8`	polyglot-child-pdf	Secondary PDF body inside pdf container at offset 0x314FB	6125 bytes

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