PDF malware analysis — malicious · e95fd46e1607d238

MALICIOUS

PDF

12.0 KB

MD5: 269135135201f00d55bbe9c94d07f2e7 SHA-1: f2a7370605ee402ef4157acbbc986b46f8a78551 SHA-256: e95fd46e1607d238dc13e6b879a3b577000a19e32c3717c78ff5cc317301b670

188 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 act as a stager. Critical heuristics indicate the use of CVE-2007-5659 (Collab.collectEmailInfo) to execute this JavaScript. The JavaScript is further processed through hex decoding and eval, suggesting it downloads and executes a second-stage payload. The presence of multiple deobfuscated JavaScript files indicates a complex multi-stage attack.

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` `a6acc3a56ed97c47aaba3d80adce504dd0a617f4210ed2cd41c9865cc67dd574`	deobfuscated-js	annotation-subject callee-key decoded JavaScript at offset 0x14A	5119 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` `8110c6231f3849293ddba9f3910abaf943a082769f4a780d42f4b2f578adc365`	deobfuscated-js	repeated-marker hex decoded JavaScript at offset 0x2D6	12153 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` `ffdbe25073a2056c43d014ebe5a7fdcec700a6bf37ab1c7ef8ea2c06d8496a62`	deobfuscated-js	PDF JavaScript deobfuscation pass	79192 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 long base64-like blob(s).

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