PDF malware analysis — malicious · a0ee862677453af8

MALICIOUS

PDF

9.3 KB

MD5: aba1e85aa6195fdafeefe73709028f83 SHA-1: 416f9b27525e187f778a96292a41cf6f1a17d598 SHA-256: a0ee862677453af8dc1e9463179ce9e25650d7e0fa2dc5da993406086845c62c

126 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.002 Malicious File

The PDF document contains embedded JavaScript that is triggered by the CVE-2007-5659 vulnerability, specifically using the 'Collab.collectEmailInfo' method. This JavaScript acts as a stager, deobfuscating and executing further stages. The primary intent appears to be the download and execution of a second-stage payload, as indicated by the presence of multiple deobfuscated JavaScript files and the critical heuristic firing for the exploit.

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` `86bcafe825a351290c2b56121e62fdfe7d218e09b5e31bf0efb7cf6b27d7e4f4`	deobfuscated-js	annotation-subject callee-key decoded JavaScript at offset 0x14A	4957 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` `308fa21991c3096aef46b157e449a9d08857d2c1dcab3fbb2e910c839bbc4de0`	deobfuscated-js	repeated-marker hex decoded JavaScript at offset 0x2CA	11893 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` `8b91da719996b80f1fd2bf1eb56a49ddf9ad10320f484e258a161e48e11245f0`	deobfuscated-js	PDF JavaScript deobfuscation pass	43075 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 long base64-like blob(s).

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