PDF malware analysis — malicious · 0f2b696096603898

MALICIOUS

PDF

75.9 KB

MD5: 01bdcc1d8e7d731ef0146f5ca6dc3674 SHA-1: 686e6a4ee2b1d261d7ed8ca1d6c406c90ae57b38 SHA-256: 0f2b696096603898672647016604dfcf845991481243c3c87117652cb886a503

256 Risk Score

Malware Insights

MITRE ATT&CK

T1203 Exploitation for Client Execution T1059.007 JavaScript

This PDF document contains heavily obfuscated JavaScript, identified as a binary-XOR decoded stager. The heuristics indicate it exploits CVE-2007-5659 by leveraging the 'Collab.collectEmailInfo' method to execute a second-stage payload. The JavaScript is designed to decode and evaluate exploit code, targeting a known vulnerability in older Adobe Reader versions.

Machine Learning

Nyx PDF Classifier malicious score 1.0000

Heuristics 8

Collab.collectEmailInfo — CVE-2007-5659 critical CVE exact CVE_2007_5659

PDF JavaScript calls Collab.collectEmailInfo — CVE-2007-5659 is a buffer overflow in Adobe Reader triggered by a long argument or heap-sprayed message field passed to Collab.collectEmailInfo(). Part of a series of Acrobat JS API exploits. (identified after JavaScript deobfuscation)
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.
eval() call high PDF_EVAL

eval() found — commonly used for obfuscated exploit execution
Binary-XOR JavaScript stager high PDF_BINARY_XOR_JS_STAGER

PDF JavaScript stores viewer-version payload branches as long binary digit strings, XORs each bit pair, converts 8-bit chunks with String.fromCharCode, and evals the recovered exploit stage.
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.
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.

Extracted artifacts 3

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj0004_000.js` `3bba19840cd26c1db233ee18ba1d156a804edaed452450c711ae706151082f3c`	pdf-javascript-stream	PDF /JS object 4 at offset 0xC0	77434 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 3 eval/decoder/string-building token(s). Carved artifact contains 6 long base64-like blob(s).
`javascript_obj0004_001.js` `f1069e8b8cf18c745d76e65210e684efb4a5654fecc59623e836f64b18f56822`	pdf-javascript-stream	PDF /JS object 4 at offset 0xE3	77545 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 3 eval/decoder/string-building token(s). Carved artifact contains 6 long base64-like blob(s).
`binary_xor_stage_000.js` `9b8bf8faee4032959cdc3c8d0a9f27f55db87b93175e9dc2f097c51a7c5062d2`	deobfuscated-js	binary-XOR decoded JavaScript at offset 0x3D7	1267 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 3 eval/decoder/string-building token(s).

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