PDF malware analysis — malicious · b502db5d34f553a9

MALICIOUS

PDF

12.2 KB

MD5: 34381fdebbc09b9fc2b1f60b3766bab1 SHA-1: 4bd2f9c523103bab346f88b58b80c80700725b17 SHA-256: b502db5d34f553a9da1bf293003decbe3de3b7696d344cc4805f41ab632b773c

178 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 JavaScript/JScript T1204.001 Malicious Link/URL T1071.001 Web Protocols

The PDF file contains embedded JavaScript, specifically identified as a stager exploiting CVE-2007-5659 via the `collab.collectEmailInfo` function. This JavaScript is heavily obfuscated but decodes into a larger script responsible for further malicious actions. The primary intent appears to be downloading and executing a second-stage payload, indicated by the heuristic `PDF_ANNOT_SUBJECT_CALLEE_HEX_STAGER` and the presence of a deobfuscated JavaScript file. The `CLAMAV_DETECTION` heuristic confirms its malicious nature.

Heuristics 6

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)
ClamAV: Pdf.Exploit.Agent-36165 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Exploit.Agent-36165
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` `3f254d15363cfc46f758dc79a2cb1074c4072b68aa3f4c80a9bf6696d85176e0`	pdf-javascript-stream	PDF /JS object 7 at offset 0x1A6	1045 bytes
`annotation_subject_callee_hex_stage_000.js` `0937e26e650a906220264b919a5f90fec3e61bad386e38d2c09b8d964b5238cb`	deobfuscated-js	annotation-subject callee-key decoded JavaScript at offset 0x14F	5223 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 5 eval/decoder/string-building token(s).

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