PDF malware analysis — malicious · 8aaa420a4a50737f

MALICIOUS

PDF

12.5 KB

MD5: efbae850ee3698185e417971b03e7f89 SHA-1: d5c58492ea2c60d2028619cb26e6587eb0d39b6d SHA-256: 8aaa420a4a50737f0b21970318b0f3d7709621f64d124796863c5fe571cafea5

120 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.001 Malicious Link

The PDF file contains embedded JavaScript that is obfuscated and appears to be a stager. The critical heuristic CVE_2007_5659 indicates the exploitation of a known vulnerability in Adobe Reader (Collab.collectEmailInfo) to execute this JavaScript. The deobfuscated JavaScript is substantial, suggesting it performs complex actions, likely downloading and executing a second-stage payload. The presence of JavaScript actions and embedded JS streams further supports this attack pattern.

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` `0df291d69669aabea8d48539ff6e3447b14e49a861871000e6476334f075bd19`	pdf-javascript-stream	PDF /JS object 7 at offset 0x1A6	1011 bytes
`annotation_subject_callee_hex_stage_000.js` `7e80fcfd2b631e28af4f1c5ae60dbb6b931c717e3969f7e21f8daded45f8bfec`	deobfuscated-js	annotation-subject callee-key decoded JavaScript at offset 0x14F	5179 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 5 eval/decoder/string-building token(s).

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