PDF malware analysis — malicious · dd56c8cf39a537a7

MALICIOUS

PDF

12.4 KB

MD5: 7a373c6336d8b389b42a3b86aea65b0b SHA-1: b4ff94a70ef4b07cfce122012773c8bf949b9934 SHA-256: dd56c8cf39a537a780114046f90318254e04efdec2e33f0208f8433192aba679

156 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 JavaScript/JScript T1204.001 Malicious Link/Object T1027 Obfuscated Files or Information

The PDF file contains embedded JavaScript, identified by the PDF_JAVASCRIPT and PDF_JS heuristics. A critical heuristic, CVE_2007_5659, specifically indicates the use of the Collab.collectEmailInfo method to launch a JavaScript stager. This stager is heavily obfuscated and hex-encoded, as suggested by the PDF_ANNOT_SUBJECT_CALLEE_HEX_STAGER heuristic and the presence of 'annotation_subject_callee_hex_stage_000.js'. The script's purpose is to decode and execute a further payload, likely for malicious purposes. The extracted JavaScript files are included as IOCs.

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` `0df291d69669aabea8d48539ff6e3447b14e49a861871000e6476334f075bd19`	pdf-javascript-stream	PDF /JS object 7 at offset 0x1A6	1011 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s).
`annotation_subject_callee_hex_stage_000.js` `24b4eb369bd0c1f9246587d8dabaa919b22e317a67052d2a0d97f761d82709b9`	deobfuscated-js	annotation-subject callee-key decoded JavaScript at offset 0x14F	5233 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 5 eval/decoder/string-building token(s).

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