PDF malware analysis — malicious · 1cb344a86f8dd948

MALICIOUS

PDF

12.4 KB

MD5: f157b08057f9e073ddbc7b8ad6b08877 SHA-1: 764c8ab709859c9c7e35e11eed21762516d3e3f6 SHA-256: 1cb344a86f8dd9481eb3490c832209fccba3922e5cf501450887c815e934592f

120 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.001 Malicious Link

The PDF file contains embedded JavaScript, specifically a stager that leverages CVE-2007-5659 by using the Collab.collectEmailInfo method. This stager decodes a hex-encoded JavaScript payload, which is then executed. The recovered JavaScript is heavily obfuscated but appears to be designed to download and execute a second-stage payload. The presence of PDF-specific JavaScript actions and the critical CVE-2007-5659 firing strongly indicate a malicious PDF exploiting a known vulnerability.

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` `a811dafd47f4125505ca0b4b012b636b396a228bfc85582503026554bf398994`	deobfuscated-js	annotation-subject callee-key decoded JavaScript at offset 0x14F	5217 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 5 eval/decoder/string-building token(s).

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