PDF malware analysis — malicious · dc330c3debf05fbd

MALICIOUS

PDF

68.2 KB Created: 2008-10-21 11:20:17 +02:00 Authoring application: Acrobat PDFMaker 7.0.5 for Word (via Acrobat Distiller 7.0.5 (Windows))

MD5: 3f35842d5e92a2951ef7d0a5c40b5e0b SHA-1: cf4f8f113f91ff19e542a28f97b4954a2278eb78 SHA-256: dc330c3debf05fbd6d0fd6b6521f8a7700cfcdff6750fa0d5081b24d6b097538

126 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell

The PDF file contains multiple embedded JavaScript streams, with one stream exhibiting significant obfuscation and containing eval() and String.fromCharCode() calls. This strongly suggests the execution of arbitrary code. The ClamAV detection 'Pdf.Dropper.Agent-7312541-0' further confirms its malicious nature as a dropper. The primary function appears to be the execution of obfuscated JavaScript, which is a common technique for downloading and executing further stages of malware.

Heuristics 7

ClamAV: Pdf.Dropper.Agent-7312541-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Dropper.Agent-7312541-0
eval() call high PDF_EVAL

eval() found — commonly used for obfuscated exploit execution (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.
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)
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/pdfx/1.3/
- http://ns.adobe.com/xap/1.0/
- http://ns.adobe.com/xap/1.0/mm/
- http://purl.org/dc/elements/1.1/
- http://ns.adobe.com/photoshop/1.0/

Extracted artifacts 12

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj0177_001.js` `4b024e23c65bfca25f3ae333f366444cecd6a5c9b6de4aa5317d59031ba7404c`	pdf-javascript-stream	PDF /JS object 177 at offset 0xD7FC	125 bytes
`javascript_obj0180_002.js` `75de26c7269a06fc7825d89a4493e04c155efbc3d382c286d2ca06aa600a7a01`	pdf-javascript-stream	PDF /JS object 180 at offset 0xD9F9	164 bytes
`javascript_obj0181_003.js` `d9b0adb46e43b8cd8f2eb61236ec7a0221ad24b9a1f7645cda6a8eab5b3017a2`	pdf-javascript-stream	PDF /JS object 181 at offset 0xDAE2	71 bytes
`javascript_obj0182_004.js` `23848f82ba8dd1727256c379d74d46b173e4203c87038b552108fe1a31085ace`	pdf-javascript-stream	PDF /JS object 182 at offset 0xDB66	226 bytes
`javascript_obj0183_005.js` `87df0063dd37411bf7c05daea98911845ff37309944eb19a3a431442ccb6b0c5`	pdf-javascript-stream	PDF /JS object 183 at offset 0xDC91	123 bytes
`javascript_obj0186_006.js` `e7d2b044057b58674be0ea0c54e16627d204280bd51d432a58b60a9f0330023b`	pdf-javascript-stream	PDF /JS object 186 at offset 0xDF2A	155 bytes
`javascript_obj0173_007.js` `548e830acb60b0693c1287a313d05733670f9866b62a498e4d2851f47f69d7f1`	pdf-javascript-stream	PDF /JS object 173 at offset 0xBB76	2796 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 4 eval/decoder/string-building token(s).
`javascript_obj0179_008.js` `72c2057e454a7b396f11686f58a7dfb1a3f5cdf0a6f3083f5b3095f3a2d66490`	pdf-javascript-stream	PDF /JS object 179 at offset 0xD8F3	348 bytes
`javascript_obj0185_009.js` `47dcb0f74a1455cf5ab1be391b91fea4dd0f57a1ba23cc0302991a79c6f44034`	pdf-javascript-stream	PDF /JS object 185 at offset 0xDD84	839 bytes
`javascript_obj0188_010.js` `137658fa3aca71ffe89611ab5a7e3145f16d99c4c39ee9d0da35be2e4e954e19`	pdf-javascript-stream	PDF /JS object 188 at offset 0xE030	682 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 4 eval/decoder/string-building token(s).
`javascript_obj0192_011.js` `7e836de381f2f76b8ff329849b67b7900327d366bd492b589f305466c82424f1`	pdf-javascript-stream	PDF /JS object 192 at offset 0xFA7A	1953 bytes
`icc_00_off00004f73.icc` `2b3aa1645779a9e634744faf9b01e9102b0c9b88fd6deced7934df86b949af7e`	pdf-icc-profile	PDF ICC profile at offset 0x4F73	3144 bytes

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