PDF malware analysis — malicious · c0c07d660d19d5d9

MALICIOUS

PDF

12.3 KB

MD5: b452172b5b80161bdbf2b6d176ccb46d SHA-1: 18dadeb0fae9b3d3c96dfc2f22faab1ce3f07c13 SHA-256: c0c07d660d19d5d98bd85668f5926b449c0d1b263c1dd01e81a9efd4d18ab5c6

186 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.001 Malicious Link

The PDF file contains embedded JavaScript that is obfuscated and designed to be executed via the CVE-2007-5659 vulnerability in Adobe Reader, specifically leveraging the 'collab.collectEmailInfo' function. The extracted JavaScript artifacts, including 'annotation_subject_callee_hex_stage_000.js' and 'deobfuscated.js', indicate a stager mechanism. This stager is likely responsible for downloading and executing a second-stage payload, although the final payload and its destination are not directly recoverable from the static analysis.

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: Pdf.Exploit.Agent-36063 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Exploit.Agent-36063
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` `eb39e2de4dbbc100de6d3e30aa43ff78fa075618862ba1ebba5151ea3a3b848d`	pdf-javascript-stream	PDF /JS object 7 at offset 0x19D	273 bytes
`annotation_subject_callee_hex_stage_000.js` `6afdfbcfecad2c76efdce7ee15d4d4ed1dd2b940e28826c0703c41bd9efb11db`	deobfuscated-js	annotation-subject callee-key decoded JavaScript at offset 0x14A	5264 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` `90596bbed6cf9975cb30185a05ff8ec4645c3e6911b5afc169c4da363daff01a`	deobfuscated-js	repeated-marker hex decoded JavaScript at offset 0x2D6	12415 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` `7ea1896c5fa9badeb80931e70f7ca9511ae3e36847246c5f69c83a23c3d08a0c`	deobfuscated-js	PDF JavaScript deobfuscation pass	77944 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 long base64-like blob(s).

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