PDF malware analysis — malicious · 5ad1be9e5e12c4a6

MALICIOUS

PDF

87.7 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: 19450f8e62cc10113b235ff324cae445 SHA-1: 28ad99f5fffcc4e51320729390618350e88c896c SHA-256: 5ad1be9e5e12c4a626e974e5d8ad78e132be33a91d5aa20011d2b175b366f802

220 Risk Score

Malware Insights

MITRE ATT&CK

T1059.007 JavaScript T1203 Exploitation for Client Execution T1566.001 Spearphishing Attachment

The PDF sample contains multiple JavaScript streams, with critical heuristics indicating an exploit cluster involving eval() and String.fromCharCode. This suggests the JavaScript is designed to download and execute a secondary payload. ClamAV also detected this as Pdf.Dropper.Agent-6307740-0, reinforcing its role as a dropper. No specific malware family could be identified.

Machine Learning

Nyx PDF Classifier malicious score 0.5677

Heuristics 9

PDF JavaScript exploit cluster critical PDF_JS_EXPLOIT_CLUSTER

PDF combines an executable JavaScript/action surface with exploit staging indicators such as eval/unescape/fromCharCode, XFA script content, or a related CVE pattern. Benign form JavaScript remains low-severity, but this correlated cluster is high-confidence malicious behavior.
ClamAV: Pdf.Dropper.Agent-6307740-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Dropper.Agent-6307740-0
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)
Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL

The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
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/
- http://www.iec.ch

Extracted artifacts 15

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
`javascript_obj0195_012.js` `43c00eb73bdfa495c4633d55e3dcf96f8075ab475973c6e113ca5ae00f777aff`	pdf-javascript-stream	PDF /JS object 195 at offset 0x115EB	1920 bytes
`stream_026_off0001311c.js` `bb24839c735b75b5a17c5d1f306f9bfd75adf0eea4cd379fbd5a4e7df263cdc5`	decompressed-pdf-stream	PDF FlateDecoded stream at offset 0x1311C	680 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 4 eval/decoder/string-building token(s).
`stream_028_off00014a91.js` `1543e9aa82f174befe9cad258b5c79a1d678664173ad95e6844c24a1a8e03126`	decompressed-pdf-stream	PDF FlateDecoded stream at offset 0x14A91	594 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s).
`icc_00_off00004f73.icc` `2b3aa1645779a9e634744faf9b01e9102b0c9b88fd6deced7934df86b949af7e`	pdf-icc-profile	PDF ICC profile at offset 0x4F73	3144 bytes

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