PDF / .CVY malware analysis — malicious · a41e7a4521756649

MALICIOUS

PDF / .CVY

9.5 KB

MD5: add12ebc57e7c0c95d3d850eae2b3f30 SHA-1: 1e8d04413dc9b3f7c86c1022d7cb5e4e36a19885 SHA-256: a41e7a452175664919a95cfd2df9f18e2c0d1d6a460fc8aac171329050ccac7a

186 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.001 Malicious Link

The PDF file contains obfuscated JavaScript, identified by multiple heuristics including 'PDF_JAVASCRIPT', 'PDF_JS', and 'PDF_ANNOT_SUBJECT_CALLEE_HEX_STAGER'. The critical 'CVE_2007_5659' heuristic specifically indicates the use of the Collab.collectEmailInfo method to exploit a vulnerability, likely to download and execute a second-stage payload. The presence of deobfuscated JavaScript files further supports this. The attack pattern involves exploiting a known PDF vulnerability to achieve arbitrary code execution.

Heuristics 7

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: Heuristics.PDF.ObfuscatedNameObject critical CLAMAV_DETECTION

ClamAV detected this file as malware: Heuristics.PDF.ObfuscatedNameObject
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` `11b03694c4e705ab29873cc5e2c55342ee498b376ac2dc5f05ce17018ef44c38`	pdf-javascript-stream	PDF /JS object 7 at offset 0x19D	264 bytes
`annotation_subject_callee_hex_stage_000.js` `7f689c035e359b6d09b07c2bc39aec426799f92a60b5d821cab746b572e25a5b`	deobfuscated-js	annotation-subject callee-key decoded JavaScript at offset 0x14A	5160 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` `828e3831a3aab6a47e255af3ec3c6436d73f2b3be50855f1845ee6a14077ccab`	deobfuscated-js	repeated-marker hex decoded JavaScript at offset 0x2CC	12181 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` `3bd917d0bcadac08dc5bf698cb494e24d8895bc8e08a8d2fbd368cee6d1251b5`	deobfuscated-js	PDF JavaScript deobfuscation pass	65174 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 long base64-like blob(s).

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