PDF malware analysis — malicious · 83259589279c25a9

MALICIOUS

PDF

12.0 KB

MD5: 54a7a19348ffadee47977cb088b87b0e SHA-1: f8b661d20583d660af4b783bdf281daf628f01b8 SHA-256: 83259589279c25a9284ce3ecf03f5c52b09f51fe86f97b7b3c662fd6dffb3936

216 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 JavaScript T1204.002 Malicious File

The PDF file contains embedded JavaScript, identified by the 'PDF_JAVASCRIPT' and 'PDF_JS' heuristics. The 'CVE_2007_5659' and 'PDF_ANNOT_SUBJECT_CALLEE_HEX_STAGER' heuristics indicate that the file exploits a known vulnerability (CVE-2007-5659) to execute a hex-decoded JavaScript stager. This stager is designed to download and execute a second-stage payload, as suggested by the 'EXTRACTED_FILE_STATIC_TRIAGE' heuristic which flags suspicious script obfuscation and extracted JavaScript files. The ClamAV detection further 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.
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` `3f254d15363cfc46f758dc79a2cb1074c4072b68aa3f4c80a9bf6696d85176e0`	pdf-javascript-stream	PDF /JS object 7 at offset 0x1A6	1045 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s).
`annotation_subject_callee_hex_stage_000.js` `3570e607f3ea9ceaf8ca8bd11e86502096c39889bbe6ffc75bb978e8ffc3ef40`	deobfuscated-js	annotation-subject callee-key decoded JavaScript at offset 0x14F	5061 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 5 eval/decoder/string-building token(s).

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