PDF malware analysis — malicious · 7ae41f4fd4fc43e2

MALICIOUS

PDF

106.2 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: f33195938dccdcd3be5990ee1fb76f08 SHA-1: 324dc9ec06ab6b83d4aa9ad5df078a3cf8b1b1af SHA-256: 7ae41f4fd4fc43e2996cb3d597855f629d082fa7c6bff83e2a759107af0f28b8

220 Risk Score

Malware Insights

MITRE ATT&CK

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

The PDF file contains embedded JavaScript that utilizes eval() and String.fromCharCode, indicating an attempt to obfuscate malicious code. Heuristics and ClamAV detection strongly suggest this is an exploit targeting PDF vulnerabilities for client execution. The JavaScript functions appear to be part of a hashing algorithm, likely used to process or deobfuscate a payload before execution. No specific URLs or domains were found to be malicious, but the presence of exploit code and obfuscated JavaScript points to a downloader or dropper.

Machine Learning

Nyx PDF Classifier malicious score 0.5520

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.Exploit.Agent-2174 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Exploit.Agent-2174
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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