PDF malware analysis — malicious · 696139fcb0695875

MALICIOUS

PDF

20.8 KB

MD5: 18b3579f93533804b03adbe0e218614c SHA-1: 8602ed85fdf97dcaccab7123c415de7544c5e67a SHA-256: 696139fcb06958758212bb3c0e8571050e59f7b8d5ea001f862e1bf93297b1b6

310 Risk Score

Malware Insights

MITRE ATT&CK

T1203 Exploitation for Client Execution T1059.007 JavaScript

The PDF sample contains embedded JavaScript that leverages the CVE-2007-5659 vulnerability (Collab.collectEmailInfo) to execute arbitrary code. This JavaScript is heavily obfuscated but ultimately decodes to a URL that is used to download a secondary payload. The presence of exploit-related heuristics and the embedded download URL strongly indicate a malicious document designed to compromise the user's system.

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` `77463f403e5061442e9bf08534c323e2d8c880288abeaa7a4f8a1d950698f0ed`	pdf-javascript-stream	PDF /JS object 111711 at offset 0x18E	3855 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s). Carved artifact contains 6 long base64-like blob(s).
`javascript_obj111712_001.js` `56c8faa0ef26110192d1c28db8014b79323c3d91469a71c30ada931d6ccd521f`	pdf-javascript-stream	PDF /JS object 111712 at offset 0x10D3	15349 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` `64214a1710f6ca1b0085b2fa5b2fd6937bbd75237a366508783c4aade86c6adb`	pdf-javascript-stream	PDF /JS object 111713 at offset 0x4CFE	1522 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s). Carved artifact contains 6 long base64-like blob(s).
`javascript_obj111711_003.js` `8949f55ff094815e9bb51031c276aabb700087617f13a9be1e8708093b132918`	pdf-javascript-stream	PDF /JS object 111711 at offset 0x1B2	20881 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 3 eval/decoder/string-building token(s). Carved artifact contains 17 long base64-like blob(s).
`javascript_obj111712_004.js` `1eaaaa1879478a34270afc6cda5db7503297b1088e20192b98b8a3dd4d0ccc1e`	pdf-javascript-stream	PDF /JS object 111712 at offset 0x10F7	16972 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s). Carved artifact contains 11 long base64-like blob(s).
`javascript_obj111713_005.js` `d8fd497a3804677d16c36eda27c2f6fdaf0632a8acd752915a4b8374ca2a8cc8`	pdf-javascript-stream	PDF /JS object 111713 at offset 0x4D20	1571 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s). Carved artifact contains 6 long base64-like blob(s).
`legacy_pdfkit_stage_000.js` `e1ef57e355b39268ad264cc25028a9a0e38b4699b467c94913104d44e9e6dafc`	deobfuscated-js	multi-marker percent-array decoded JavaScript at offset 0x10D3	1470 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` `912f089080ba620455ed7fe3ce4f11484bef379fd5634fb8ed14b27c2a8e1e3c`	deobfuscated-js	multi-marker percent-array decoded JavaScript at offset 0x4CFE	87 bytes
`legacy_pdfkit_stage_002.js` `f8f26e3184fdd523b18bb41f22ccf74392a8a1e1eba3f36e709fb9e9eee6a235`	deobfuscated-js	multi-marker percent-array decoded JavaScript at offset 0x1B2	1558 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` `f4170766465e4655da20ec6097601bbdde65a49fc4ba94c6c68ef9a052b441c6`	deobfuscated-js	multi-marker percent-array combined decoded JavaScript at offset 0x10D3	7882 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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