PDF malware analysis — malicious · a9ae64d1c1dfb619

MALICIOUS

PDF

12.5 KB

MD5: a12e4cf4fd0f482a101513f4468ebca4 SHA-1: 774edb1e803a58a64f2cf1ab3c63b709a3759523 SHA-256: a9ae64d1c1dfb61981a3b8d2b72ca651e5475aec8d80717de707fe29de542bde

118 Risk Score

Malware Insights

MITRE ATT&CK

T1204.002 Malicious File T1059.001 PowerShell

The sample is a PDF file that leverages the CVE-2007-5659 vulnerability (Collab.collectEmailInfo) to execute embedded JavaScript. This JavaScript is heavily obfuscated but appears to function as a stager, decoding and executing a secondary payload. The primary attack vector is the exploitation of a known PDF reader 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` `0df291d69669aabea8d48539ff6e3447b14e49a861871000e6476334f075bd19`	pdf-javascript-stream	PDF /JS object 7 at offset 0x1A6	1011 bytes
`annotation_subject_callee_hex_stage_000.js` `c81e8f66ac66edbcfc450866fc5a4dbd0b2cd2142cd766e9e7569e5f0f84f134`	deobfuscated-js	annotation-subject callee-key decoded JavaScript at offset 0x14F	5331 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 5 eval/decoder/string-building token(s).

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