PDF malware analysis — malicious · e96e9313bfa60648

MALICIOUS

PDF

9.7 KB

MD5: d64d18ba15f5cab332fd64f6c33ad56c SHA-1: e4c35acd46eb120aa076495ce98f8214136505c6 SHA-256: e96e9313bfa606482d80fd0efe610d8044bf7873b4d139aceb2c78f3f4ae8aec

126 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.001 Malicious Link or Document: User Execution: Malicious Link T1204.002 Malicious Link or Document: User Execution: Malicious Document

The PDF file contains embedded JavaScript, triggered by the CVE-2007-5659 vulnerability using the 'collab.collectEmailInfo' method. This JavaScript is heavily obfuscated but appears to be a stager designed to download and execute a second-stage payload. The presence of multiple deobfuscated JavaScript files indicates a complex execution chain. The primary attack vector is likely user interaction with the malicious PDF.

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)
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.
syncAnnotScan annotation-staging primitive low PDF_FOXIT_SYNCANNOTSCAN

PDF JavaScript calls syncAnnotScan() — a no-op annotation-enumeration primitive used by exploit-kit JavaScript to stage payload reads from annotation /Subject fields before eval(). Not a vulnerable sink itself; rarely seen in legitimate PDFs. (matched in decompressed stream)
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 4

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj0007_000.js` `b9a85ee399db318b3ad68d0755effe289a645a7404fad2094712c8a3fd042920`	pdf-javascript-stream	PDF /JS object 7 at offset 0x19B	244 bytes
`annotation_subject_callee_hex_stage_000.js` `fa7af809339790e5613418b974b60cfc21c05eaaba83b86c73f0ff93d3d3c204`	deobfuscated-js	annotation-subject callee-key decoded JavaScript at offset 0x14A	5206 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 5 eval/decoder/string-building token(s).
`legacy_pdfkit_stage_001.js` `fd7466f4a4e8f2885ab9c042ecac42fb9bbe065d6d5d40bcf89c25049f344b14`	deobfuscated-js	repeated-marker hex decoded JavaScript at offset 0x2CA	12358 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s). Carved artifact contains 1 long base64-like blob(s).
`deobfuscated.js` `13e79d31dc3554e330add924e60bb4c28657abfb4a7b981bd3b37aaa207a2c8e`	deobfuscated-js	PDF JavaScript deobfuscation pass	71341 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 long base64-like blob(s).

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