PDF malware analysis — malicious · 850bfa5a7e2030dc

MALICIOUS

PDF

11.5 KB

MD5: 6ecb945db1bea920fcdf4b5cf17c8b88 SHA-1: 8b60848d625c01086f45d1b8e0dc679eaecccfae SHA-256: 850bfa5a7e2030dc23c2894865d2a39bbd87f33cb4c2b2c9096ef1c430e1552e

156 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.001 Malicious Link

The PDF file contains embedded JavaScript, identified as a stager for CVE-2007-5659. This stager is designed to decode and execute further JavaScript, likely to download and run a malicious payload. The heuristic firings indicate the exploitation of a known Adobe Reader vulnerability (CVE-2007-5659) via an annotation subject, which then triggers the execution of obfuscated JavaScript. The primary IOC is the deobfuscated JavaScript file, which acts as the initial stage of the attack.

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` `83c89bafa116d9c91eff0b9ebda502f5bf0baa04c36fa774c6ebc2756ba3479f`	pdf-javascript-stream	PDF /JS object 7 at offset 0x1A6	585 bytes
`annotation_subject_callee_hex_stage_000.js` `f57fb5affa208b8085377e083101396150e5c0cdaec1bb868b4c811d78e4ea45`	deobfuscated-js	annotation-subject callee-key decoded JavaScript at offset 0x14F	4951 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 5 eval/decoder/string-building token(s).

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