PDF malware analysis — malicious · 86a3c6c5550a3188

MALICIOUS

PDF

20.6 KB

MD5: 2ec775f047626000d844fbde123f5f0c SHA-1: 7145289d416677fbda4a84a6849b0a43efc72893 SHA-256: 86a3c6c5550a31887023b6d8a376e20936f65846fc10e215b4f9183c89f9a888

310 Risk Score

Malware Insights

MITRE ATT&CK

T1203 Exploitation for Client Execution T1059.007 JavaScript

The PDF file contains obfuscated JavaScript that leverages the Collab.collectEmailInfo method to trigger CVE-2007-5659. This JavaScript is designed to download a second-stage payload from the URL http://gospeltoke.com/cache/.svn/.p/.l.php?l=1&spl=pdf_collab_action. The embedded JavaScript and the exploit cluster firing strongly indicate a malicious intent to execute arbitrary code.

Machine Learning

Nyx PDF Classifier malicious score 1.0000

Heuristics 9

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)
PDF JavaScript exploit cluster critical PDF_JS_EXPLOIT_CLUSTER

PDF combines an executable JavaScript/action surface with exploit staging indicators such as eval/unescape/fromCharCode, XFA script content, or a related CVE pattern. Benign form JavaScript remains low-severity, but this correlated cluster is high-confidence malicious behavior.
ClamAV detection on extracted artifact critical EXTRACTED_FILE_CLAMAV

ClamAV flagged at least one file extracted from inside this sample. Even when the wrapping document carries no AV detection of its own, a hit on the carved artifact is a strong indicator the sample is a delivery vehicle.
eval() call high PDF_EVAL

eval() found — commonly used for obfuscated exploit execution
PDF JavaScript shellcode contains an embedded download URL high PDF_JS_SHELLCODE_DOWNLOAD_URL

Decoded PDF JavaScript shellcode contains a hardcoded http(s) URL stored as little-endian %uXXXX Unicode escapes. Reader exploit shellcode embeds the second-stage fetch URL this way and pulls it down with a urlmon/URLDownloadToFile-style download-and-execute (commodity downloader behaviour rather than a specific Acrobat CVE).
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.
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.
Embedded URL info EMBEDDED_URL

One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.

URL http://gospeltube.com/cache/.svn/.p/.l.php?l=1&spl=pdf_collab_email

Extracted artifacts 10

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj111711_000.js` `81592c44b32288a4a9deb7b9221aa2a22af7a1729f958dd822c106e4e93d6f7c`	pdf-javascript-stream	PDF /JS object 111711 at offset 0x18E	3317 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s). Carved artifact contains 5 long base64-like blob(s).
`javascript_obj111712_001.js` `25b8b16ca801ffaee702534d80edcb51f75c928f913f5f9b25ca681bdb47b868`	pdf-javascript-stream	PDF /JS object 111712 at offset 0xEB9	15695 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s). Carved artifact contains 5 long base64-like blob(s).
`javascript_obj111713_002.js` `ce38a19c4d808813d47e13d947ff5bd2d33272ad6173473c9f0da37ac5d22bd4`	pdf-javascript-stream	PDF /JS object 111713 at offset 0x4C3E	1506 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s). Carved artifact contains 5 long base64-like blob(s).
`javascript_obj111711_003.js` `50630a4c631fb21c847b889f9f947877e43efad668d5afa1eb71b543e32d9dbc`	pdf-javascript-stream	PDF /JS object 111711 at offset 0x1B2	20673 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 3 eval/decoder/string-building token(s). Carved artifact contains 15 long base64-like blob(s).
`javascript_obj111712_004.js` `21d1844a523e0d1abbaef224e19fe045f47cb19a3e89faf5dc73be1ad23c2686`	pdf-javascript-stream	PDF /JS object 111712 at offset 0xEDD	17302 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s). Carved artifact contains 10 long base64-like blob(s).
`javascript_obj111713_005.js` `4c0bef74493f93b06975c67252172d2d5103a1266466986c4d12ec6b528245c0`	pdf-javascript-stream	PDF /JS object 111713 at offset 0x4C60	1555 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s). Carved artifact contains 5 long base64-like blob(s).
`legacy_pdfkit_stage_000.js` `e5ca26c5eb551d9c93d512ce454afbed6b1a9caca75d663a473cbe7c0e853161`	deobfuscated-js	multi-marker percent-array decoded JavaScript at offset 0xEB9	1473 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 3 eval/decoder/string-building token(s).
`legacy_pdfkit_stage_001.js` `8d5aa273deb43361ab867faccbbb0b3866cbac024e57a1308d35a910c63d1f6a`	deobfuscated-js	multi-marker percent-array decoded JavaScript at offset 0x4C3E	83 bytes
`legacy_pdfkit_stage_002.js` `8eed21513b37ccc6b4ed712247ef6dfdf2b1f1f356f636b543868379a0e0484a`	deobfuscated-js	multi-marker percent-array decoded JavaScript at offset 0x1B2	1557 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 3 eval/decoder/string-building token(s).
`legacy_pdfkit_stage_003.js` `8db67abe8e8ee952805134547c21d3ce55bf4fa9dc97b666ab207e04fb7dc0d8`	deobfuscated-js	multi-marker percent-array combined decoded JavaScript at offset 0xEB9	7873 bytes
Detection ClamAV: Js.Exploit.Shellcode-18 Obfuscation or payload: likely Carved artifact contains 15 eval/decoder/string-building token(s).

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