PDF malware analysis — malicious · 4de6c1c1f3598dec

MALICIOUS

PDF

89.2 KB

MD5: 98d1ff4af5cfc944c3c5ce94e4b1c2b2 SHA-1: e644e98a96ed4aa37283e556e1c69eb5c93706e6 SHA-256: 4de6c1c1f3598dec5183bc66b97fbbe7cdee9493eb12c11aec6841ff8398598d

286 Risk Score

Malware Insights

MITRE ATT&CK

T1204 Malicious File Execution T1059.001 Command and Scripting Interpreter: PowerShell T1059.007 Command and Scripting Interpreter: JavaScript/JScript

The sample is a PDF file that leverages embedded JavaScript and a Flash RichMedia exploit (CVE-2011-0611) to achieve code execution. The critical heuristic firings for PDF JavaScript exploit cluster and CVE-2011-0611 indicate a high likelihood of exploitation. The embedded JavaScript, particularly the reconstructed string from the `zz` function in `javascript_obj0029_000.js`, suggests the script is designed to download and execute a second-stage payload. The presence of multiple JavaScript streams and embedded files further supports this. The confidence is high due to the critical exploit indicators, but not absolute as the exact second-stage payload could not be determined.

Machine Learning

Nyx PDF Classifier malicious score 0.9972

Heuristics 11

Adobe Flash Player RichMedia exploit critical CVE likely CVE_2011_0611_FLASH_RICHMEDIA

PDF combines RichMedia Flash activation with an embedded AS3 SWF loader (ByteArray/loadBytes) and shellcode heap-spray staging. This is the static exploit shape associated with CVE-2011-0611 Flash content delivered through Adobe Reader.
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.
RichMedia (Flash) high PDF_RICHMEDIA

PDF contains /RichMedia (Adobe Flash) which is a historic exploit vector
Generic recovered JavaScript exploit stage high PDF_GENERIC_STAGE_RECOVERY

Bounded static stage recovery exposed hidden JavaScript through generic transforms such as null-byte collapse, percent decoding, marker replacement, arithmetic character codes, fromCharCode, numeric arrays, numeric-array minus-key decoders, alphabet-index arrays, /Producer half-difference metadata arrays, hex literals, marker-stripped Base64 literals, custom 6-bit XOR table decoders, or repeated-marker hex carriers. This rule is emitted only when the recovered stage contains exploit-like Acrobat JavaScript or shellcode markers.
ASCIIHexDecode filter (with exploit indicators) medium PDF_FILTER_HEX

Hex-encoding filter present alongside exploit delivery indicators — often used to hide payload or shellcode bytes
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.
Embedded file low PDF_EMBEDDED

PDF embeds a file attachment — could carry an executable or another weaponised document as a nested payload
XFA form low PDF_XFA

PDF uses XML Forms Architecture — can contain script logic
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://ns.adobe.com/xdp/
- http://www.xfa.org/schema/xci/2.6/
- http://www.xfa.org/schema/xfa-template/2.1/

Extracted artifacts 19

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`5.swf` `797559d3f1e4f62f7d7ec5a729b60c863e13118d22afb32eab08faf38dc7c87f`	pdf-embedded-file	PDF EmbeddedFile object 50 at offset 0x40C5	2809 bytes
`javascript_obj0029_000.js` `9dd7553388150ccced5cef7572438c76fb0f1cca59625c563aaa569a0907eefb`	pdf-javascript-stream	PDF /JS object 29 at offset 0x14146	19788 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 3 long base64-like blob(s).
`javascript_obj0039_001.js` `79a847f48c29830c80cf0408c7505d8bd07472b58ec4ea49698a533638d7bb04`	pdf-javascript-stream	PDF /JS object 39 at offset 0x1E9B	5637 bytes
`javascript_obj0056_002.js` `2b0cb364300292a88607c7b04076629077f1b58bbf9fa93686a58f4ad62ef40b`	pdf-javascript-stream	PDF /JS object 56 at offset 0x32FA	1417 bytes
`stream_004_off0000088f.bin` `69e17a0038b9273e6d005ef52313a832cb41b9cf9713d6134d0cf9f2e59298a7`	decompressed-pdf-stream	PDF FlateDecoded stream at offset 0x88F	434 bytes
`generic_stage_recovery_000.js` `2521081fc23abb636ffeff62c87c6bd1db2ae89ec419b8ba0862bc9fb257c242`	deobfuscated-js	generic stage recovery marker-MM-to-%u from JavaScript object 29 at offset 0x14146	19609 bytes
`generic_stage_recovery_001.js` `59a92aa861d0506755480142ae1f8c8ad2b0ece8045e978ba383f97b3ba7dc3b`	deobfuscated-js	generic stage recovery marker-MM-to-%u from JavaScript object 29 at offset 0x14146	13130 bytes
`generic_stage_recovery_002.js` `114a5b077cdec0da4f0492cb47e551d6092a094399fd0f8214a03324ae4affb6`	deobfuscated-js	generic stage recovery marker-MM-to-%u from combined JavaScript objects at offset 0x14146	26665 bytes
`generic_stage_recovery_003.js` `1c1fd256d04ec3b7fcd62a5fa622c8095a4c8fa6d73258a825303043c57ed8a5`	deobfuscated-js	generic stage recovery marker-MM-to-%u from combined JavaScript objects at offset 0x14146	20186 bytes
`generic_stage_recovery_004.js` `3ba64244b2b6b1c2ba5157dfb16ed66f8a46e9ce2b85a9f88be01dd28efd6412`	deobfuscated-js	generic stage recovery marker-AAAAA-to-%u from decompressed stream at 0xE51 at offset 0xE51	7789 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 long base64-like blob(s).
`generic_stage_recovery_005.js` `93522b2cf19db13aac26cb30efbe725e7f50d0c0d9c72950e2ec10073b744432`	deobfuscated-js	generic stage recovery marker-AA-to-%u from decompressed stream at 0xE51 at offset 0xE51	7821 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 long base64-like blob(s).
`generic_stage_recovery_006.js` `1e712ebe5edbaf8371bb08490c13f27a196e6404ba3ec69298268f127b801643`	deobfuscated-js	generic stage recovery marker-ffffffff-to-%u from decompressed stream at 0xE51 at offset 0xE51	2275 bytes
`generic_stage_recovery_007.js` `7a3e84e74468af182cc56d301a08b43c96c51fd1f0e434ed57bb0a0ec05510cf`	deobfuscated-js	generic stage recovery marker-AAAAA-to-%u from decompressed stream at 0x1663 at offset 0x1663	7808 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 long base64-like blob(s).
`generic_stage_recovery_008.js` `bb59b77437da40e7978965835b243176e71f6438bc83b2f308fc9e10fd1e5c70`	deobfuscated-js	generic stage recovery marker-AA-to-%u from decompressed stream at 0x1663 at offset 0x1663	7821 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 long base64-like blob(s).
`generic_stage_recovery_009.js` `d8c7f7c5a63c46f47c03f294d2589adf9fad88074c4d9526c56da11f52d1ea24`	deobfuscated-js	generic stage recovery split-literal-normalize -> marker-MM-to-%u from JavaScript object 29 at offset 0x14146	19516 bytes
`generic_stage_recovery_010.js` `c082c9288f26fc4b586be59fe29ce198606bd9f7ba7ae4c9fafeed190b7deac2`	deobfuscated-js	generic stage recovery split-literal-normalize -> marker-MM-to-%u from JavaScript object 29 at offset 0x14146	13082 bytes
`generic_stage_recovery_011.js` `b1578b761e26b84b6fb86a7f2a1cab56cd87cf339152a1763600b77e4f7d829c`	deobfuscated-js	generic stage recovery marker-MM-to-%u -> split-literal-normalize from JavaScript object 29 at offset 0x14146	19516 bytes
`font_00_sfnt_off00000e51.bin` `9520d1e3c26c38a7d8e0587578a21196782149e3c5f4b565229deafde3ff3a35`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE51	8429 bytes
`font_01_sfnt_off00001663.bin` `18f2d21f655a09be0df9f6bfb4b539e43160f5a64a3e1b2dd7a4c8a5a185a5d2`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1663	8429 bytes

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