PDF malware analysis — malicious · 6f93770db6b2bdbb

MALICIOUS

PDF

78.4 KB

MD5: eff13958a36dab00ac340d49fbb88517 SHA-1: 248a5ea7d01677efd06845250941c4b6fd78582d SHA-256: 6f93770db6b2bdbb66e1fca45a744a53ce0506dc289d8245e6cdc62c631ff2c2

256 Risk Score

Malware Insights

MITRE ATT&CK

T1203 Exploitation for Client Execution T1059.007 JavaScript

This PDF file contains obfuscated JavaScript that exploits CVE-2007-5659, a known vulnerability in Adobe Reader. The JavaScript is designed to decode and execute a second-stage payload, indicated by the 'PDF_BINARY_XOR_JS_STAGER' and 'PDF_JS_EXPLOIT_CLUSTER' heuristics. The primary goal is to achieve arbitrary code execution within the context of the vulnerable PDF viewer.

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` `7c8560d0c7689e5554e8cb1c08b81a8b457b619db17818e5f3be7d481b34be80`	pdf-javascript-stream	PDF /JS object 4 at offset 0xC0	79925 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` `dbd3da268fab7d2c797b47634eeaa97f6d5e5929e4d8c573a98da72d46283200`	pdf-javascript-stream	PDF /JS object 4 at offset 0xE3	80036 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` `92006980a720c45935ee6feee68cbfb8ebdde81bad142a902735ecfdfce6fdd2`	deobfuscated-js	binary-XOR decoded JavaScript at offset 0x6A8E	1315 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 3 eval/decoder/string-building token(s).

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