PDF malware analysis — malicious · a41ca6e86c10ac15

MALICIOUS

PDF

11.6 KB

MD5: f62809ffcc7221a073955c23f0704295 SHA-1: 9544e8ae5e27a6b4f81761ed4b4b6b885319f05e SHA-256: a41ca6e86c10ac156dce677dc3e7a35d9d8fcdd4e33984ebad42b0c5c9ff0ab3

118 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 JavaScript/JScript T1204.001 Malicious Link/URL

The PDF file contains embedded JavaScript, triggered by the 'Collab.collectEmailInfo' method, which is a known vulnerability (CVE-2007-5659). This JavaScript acts as a stager, decoding a hex-encoded payload. The recovered JavaScript is heavily obfuscated but appears to be designed to download and execute a second-stage payload. The primary attack vector is the exploitation of this PDF vulnerability to achieve arbitrary code 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.
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` `72d14aaddc3c8aca5cce10ceb494f1b001b49177ef4d6712a578b2d7723b80f6`	deobfuscated-js	annotation-subject callee-key decoded JavaScript at offset 0x14F	5038 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 5 eval/decoder/string-building token(s).

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