PDF malware analysis — malicious · 83f25ef52e725e28

MALICIOUS

PDF

2.86 MB Created: 2006-11-07 11:38:03 -07:00 Authoring application: Adobe Illustrator 11.0 (via Deep Exploration 5 5.0.5.1846 Release)

MD5: 9260e39e449deda31dcdad6da5ee7d7f SHA-1: 6f2aa4b2d58a5bd1d394820f49995f454ed27eff SHA-256: 83f25ef52e725e286d29c2aebe416c9812470c9a1e6b9cde25f970f910d7dc44

174 Risk Score

Malware Insights

MITRE ATT&CK

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

The PDF file contains embedded JavaScript that utilizes eval() and unescape() functions, indicating obfuscated code execution. The presence of U3D/3D content and related CVE indicators suggests exploitation of a 3D rendering vulnerability. The script likely downloads and executes a second-stage payload. The benign URLs extracted do not provide further clues to the attack's nature.

Heuristics 10

U3D/3D content in PDF — Adobe Reader 3D parser CVE-family indicator high CVE related PDF_U3D_CVE_RELATED

PDF contains U3D (Universal 3D) or 3D annotation content — CVE-2011-2462 and CVE-2009-3953 are critical vulnerabilities in Adobe Reader's U3D processing that allow arbitrary code execution. U3D content in PDFs is extremely rare in normal documents.
eval() call high PDF_EVAL

eval() found — commonly used for obfuscated exploit execution (matched inside decoded stream)
unescape() call high PDF_UNESCAPE

unescape() found — often used to decode shellcode in PDF JS exploits (matched inside decoded stream)
Embedded script payload in PDF stream medium PDF_EMBEDDED_SCRIPT_PAYLOAD

PDF stream bytes contain an HTML/XFA <script> tag without accompanying Windows shell-execution primitives — common in accessible XFA forms but worth surfacing for analyst review.
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.
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.
String.fromCharCode low PDF_FROMCHARCODE

String.fromCharCode found — used to construct payload strings dynamically. Common in benign JavaScript libraries for codepoint manipulation, so this alone is informational; weaponised use is also caught by the dedicated fromCharCode-stage and exploit-shape rules. (matched inside decoded stream)
Optional Content Group with action trigger low PDF_OPTIONAL_CONTENT

Optional Content Group (layer) co-occurs with an action trigger — content can be selectively hidden from viewers or scanners while the action still fires on open
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/pdf/1.3/
- http://ns.adobe.com/xap/1.0/
- http://ns.adobe.com/xap/1.0/g/img/
- http://purl.org/dc/elements/1.1/
- http://ns.adobe.com/xap/1.0/mm/

Extracted artifacts 10

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj0052_000.js` `48a78f4b219b11d13eaa65d056367b72b36cbf9d9c594d8f9863c7d1b656fdb3`	pdf-javascript-stream	PDF /JS object 52 at offset 0x1EB51	241065 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 4 eval/decoder/string-building token(s).
`stream_013_off0001cb11.js` `ebed4506b65abe19fbdb5dbfed083d11e159c3c0fd5858d07c7dae9c76556f35`	decompressed-pdf-stream	PDF FlateDecoded stream at offset 0x1CB11	21908 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 4 eval/decoder/string-building token(s).
`stream_014_off0001dbdc.js` `a9cc20b5f807a27c79c4e4f4250698867f10a7c6c3753197a600f17b57955848`	decompressed-pdf-stream	PDF FlateDecoded stream at offset 0x1DBDC	17602 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 4 eval/decoder/string-building token(s).
`stream_016_off0002acf5.bin` `ec1aa9b1b1f460f693aeeaac328f1cf0efcf919064a1506780633f657ae581de`	decompressed-pdf-stream	PDF FlateDecoded stream at offset 0x2ACF5	3367096 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact entropy is 7.67, consistent with packed or encrypted content.
`stream_017_off00270ce1.js` `4d2f3e0167f3da30aee4ca4a20dd427dad359d07bcfb6227a94bb1fa7d97142c`	decompressed-pdf-stream	PDF FlateDecoded stream at offset 0x270CE1	151466 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s).
`objstm_0073_00.bin` `83b7c3532142a006798261e590cc739a036441fe3700cc98cd561163af864e91`	pdf-objstm-decoded	PDF /ObjStm 73 0 obj (inflated)	520 bytes
`objstm_0074_00.bin` `290b8c25166634fcf7a622f11fcc7b80af062672030b70fb73f854f2ffdacd8b`	pdf-objstm-decoded	PDF /ObjStm 74 0 obj (inflated)	1019 bytes
`objstm_0085_00.bin` `fd6fb9a6c98b830c4299144fc762348ca065cced5a5c58d1d154266a0c6071e2`	pdf-objstm-decoded	PDF /ObjStm 85 0 obj (inflated)	224 bytes
`font_00_sfnt_off00000ef8.bin` `f39f99e2d4b021d4eac703afe26d32ad26f128c442f2089910c21b1f323fc85d`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xEF8	79301 bytes
`font_01_cff_off0000eb4b.bin` `ff2bd39b1311329d9bedf20dcc32a5c5691647192c7f1c6f455126503a909ee9`	pdf-font-stream	PDF embedded font (cff) at offset 0xEB4B	1558 bytes

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