PDF malware analysis — malicious · 52e511f366edaf8d

MALICIOUS

PDF

12.3 KB

MD5: dbd2a768460521d2961ffa5a94733d2f SHA-1: 4b43c7fa17eee2da92e8893139d5357f2fa82c65 SHA-256: 52e511f366edaf8da0b84d57613b3e9c446618e020b6a7ca5612bf00380e97ef

186 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 JavaScript/JScript T1204.001 Malicious Link/URL

The PDF file contains embedded JavaScript that is heavily obfuscated. Heuristics indicate the use of CVE-2007-5659, specifically targeting the `Collab.collectEmailInfo` function to execute a JavaScript stager. This stager is designed to decode and execute a larger, secondary payload, likely for further malicious activity such as downloading additional malware or establishing a backdoor. The presence of multiple deobfuscated JavaScript files suggests a complex multi-stage execution process.

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` `b52c89cde85c620177a5a1063dd2bf820b2ab36b2ed00011fe89921a66c51fd4`	deobfuscated-js	annotation-subject callee-key decoded JavaScript at offset 0x14A	5314 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` `93c141021098203dcaee04e83e9a75b9ec262e48702a0ac71a3b5cb3bc995f96`	deobfuscated-js	repeated-marker hex decoded JavaScript at offset 0x2D6	12562 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` `6233735b23188d7f218a58bb4aeecc6e00087cb9b6ba147e5e07487d114b0d1e`	deobfuscated-js	PDF JavaScript deobfuscation pass	79630 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 long base64-like blob(s).

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