PDF malware analysis — malicious · 3581d66ff0dd0ea1

MALICIOUS

PDF

12.5 KB

MD5: 42d6b32f595cf2743727862103b1659f SHA-1: cf54191d6ae728b6af44d6c4bac1cfcad90aadd6 SHA-256: 3581d66ff0dd0ea1b58c9e5489b3254bafe7ace5959135511befebe408b4e950

156 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 JavaScript/JScript T1204.002 Malicious File

The PDF file contains embedded JavaScript, triggered by the CVE-2007-5659 vulnerability related to 'Collab.collectEmailInfo'. This JavaScript is heavily obfuscated and appears to be a stager that decodes and executes a second-stage payload. The recovered JavaScript file 'annotation_subject_callee_hex_stage_000.js' is 5259 bytes, indicating a significant amount of code, likely for payload delivery or execution.

Heuristics 5

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)
Annotation subject callee-key hex JavaScript stager high PDF_ANNOT_SUBJECT_CALLEE_HEX_STAGER

PDF JavaScript uses syncAnnotScan()/getAnnots() to read an indirect annotation /Subject stream, percent-decodes it through marker replacement, then uses a callee.toString()-derived key to decode and eval the final exploit stage.
Suspicious extracted artifact high 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.
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.

Extracted artifacts 2

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj0007_000.js` `0df291d69669aabea8d48539ff6e3447b14e49a861871000e6476334f075bd19`	pdf-javascript-stream	PDF /JS object 7 at offset 0x1A6	1011 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s).
`annotation_subject_callee_hex_stage_000.js` `a378dffb73ccfd714ddfe0f8dbcbee155f33bd9cf0c1774995fa159fba860be4`	deobfuscated-js	annotation-subject callee-key decoded JavaScript at offset 0x14F	5259 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 5 eval/decoder/string-building token(s).

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