PDF malware analysis — malicious · 7b75b36d7c8d2ef6

MALICIOUS

PDF

11.8 KB

MD5: e75d5f91079ceacd0fe51b57932e52c0 SHA-1: db3f7d1029ccfac4f049de26067407a173be4a1a SHA-256: 7b75b36d7c8d2ef6ca7b2e0517f367d423c7d92c3c7be366b14fc9051c12c834

118 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 JavaScript/Shell Script Execution: JavaScript Execution T1204.002 Malicious File Execution: User Execution: Malicious JavaScript

The PDF file contains embedded JavaScript, identified as a stager for CVE-2007-5659. This script is designed to be executed by the PDF reader, likely to download and run a subsequent malicious payload. The presence of the 'Collab.collectEmailInfo' object and the hex-decoding mechanism strongly indicate exploitation of this known vulnerability. No specific family could be identified, but the delivery mechanism is clear.

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.
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.
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 2

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj0007_000.js` `83c89bafa116d9c91eff0b9ebda502f5bf0baa04c36fa774c6ebc2756ba3479f`	pdf-javascript-stream	PDF /JS object 7 at offset 0x1A6	585 bytes
`annotation_subject_callee_hex_stage_000.js` `1351f5fff7ba95c38c2dea7ce4f32f8ef39ca83f04eda68bdf00dd06d70d19df`	deobfuscated-js	annotation-subject callee-key decoded JavaScript at offset 0x14F	5075 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 5 eval/decoder/string-building token(s).

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