PDF malware analysis — malicious · 2b88777ee8f67a97

MALICIOUS

PDF

135.3 KB Created: 2009-11-01 11:53:18 UTC Authoring application: Acrobat Editor 8.0 (via Adobe Acrobat 8.0)

MD5: c07ba83bcc8b88b3e99c5ea38b3d801f SHA-1: 32c4ad21b9cd76ea5222f4fe4a4d33fbc054e6df SHA-256: 2b88777ee8f67a9763901acc58efaf50e1f7cd9fdc07f6675af5279bab4eda02

156 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.002 Malicious File

The PDF contains embedded JavaScript, with multiple heuristics indicating obfuscation and the use of eval() and String.fromCharCode(). This strongly suggests the script is designed to download and execute a secondary payload. The ClamAV detection of 'Pdf.Dropper.Agent-7243378-0' further supports its role as a dropper. No specific family could be identified due to the generic nature of the dropper and lack of further indicators.

Machine Learning

Nyx PDF Classifier malicious score 0.9672

Heuristics 7

ClamAV: Pdf.Dropper.Agent-7243378-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Dropper.Agent-7243378-0
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/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 14

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj0028_001.js` `4b024e23c65bfca25f3ae333f366444cecd6a5c9b6de4aa5317d59031ba7404c`	pdf-javascript-stream	PDF /JS object 28 at offset 0x8C0	125 bytes
`javascript_obj0030_002.js` `75de26c7269a06fc7825d89a4493e04c155efbc3d382c286d2ca06aa600a7a01`	pdf-javascript-stream	PDF /JS object 30 at offset 0x9B2	164 bytes
`javascript_obj0032_003.js` `d9b0adb46e43b8cd8f2eb61236ec7a0221ad24b9a1f7645cda6a8eab5b3017a2`	pdf-javascript-stream	PDF /JS object 32 at offset 0xBA2	71 bytes
`javascript_obj0033_004.js` `23848f82ba8dd1727256c379d74d46b173e4203c87038b552108fe1a31085ace`	pdf-javascript-stream	PDF /JS object 33 at offset 0xC24	226 bytes
`javascript_obj0034_005.js` `87df0063dd37411bf7c05daea98911845ff37309944eb19a3a431442ccb6b0c5`	pdf-javascript-stream	PDF /JS object 34 at offset 0xD4D	123 bytes
`javascript_obj0039_008.js` `b57072fe6fed59a2d996e2c9fbe887d410c7a573c06ce560f98eaa0b56e33aae`	pdf-javascript-stream	PDF /JS object 39 at offset 0x1068	48 bytes
`javascript_obj0040_009.js` `95c4b23f30af1b8aa7b6773cce9f7b5104eed8f0d0421e880b0dc6617df11a0b`	pdf-javascript-stream	PDF /JS object 40 at offset 0x10CF	75 bytes
`javascript_obj0031_010.js` `5ff66e5bc3d0a03802dae5f6ac2be67a30736471c289347332751c7c0cad269f`	pdf-javascript-stream	PDF /JS object 31 at offset 0xA99	350 bytes
`javascript_obj0037_011.js` `47dcb0f74a1455cf5ab1be391b91fea4dd0f57a1ba23cc0302991a79c6f44034`	pdf-javascript-stream	PDF /JS object 37 at offset 0xE77	839 bytes
`javascript_obj0042_012.js` `bb24839c735b75b5a17c5d1f306f9bfd75adf0eea4cd379fbd5a4e7df263cdc5`	pdf-javascript-stream	PDF /JS object 42 at offset 0x117B	680 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 4 eval/decoder/string-building token(s).
`javascript_obj0076_013.js` `05e1122f756212b91add060dc4fa0d1cc8b96dd408c16f47c5a582388c0f57f8`	pdf-javascript-stream	PDF /JS object 76 at offset 0x15399	753 bytes
`javascript_obj0078_014.js` `9a9e7241c61581528f45af5343bbcafcfc879727473a28e8214e81ade2c8866a`	pdf-javascript-stream	PDF /JS object 78 at offset 0x1556B	1809 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 4 eval/decoder/string-building token(s).
`stream_008_off00002f45.js` `1543e9aa82f174befe9cad258b5c79a1d678664173ad95e6844c24a1a8e03126`	decompressed-pdf-stream	PDF FlateDecoded stream at offset 0x2F45	594 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s).
`stream_028_off000195d7.js` `5035bc3b6b32267e2f8b6b1b003ca05a01ed39386941cb57174748b2232837db`	decompressed-pdf-stream	PDF FlateDecoded stream at offset 0x195D7	839 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 4 eval/decoder/string-building token(s).

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