PDF malware analysis — malicious · 6a6ae3d6758925d8

MALICIOUS

PDF

23.5 KB

MD5: c24be8b70efcd81f827abe87085fd2b1 SHA-1: 086dcde99748c1ca6469bde41dca67ad19150078 SHA-256: 6a6ae3d6758925d826dcab0304b966229c1ffd99e0330785a06d0729da99d755

310 Risk Score

Malware Insights

MITRE ATT&CK

T1203 Exploitation for Client Execution T1059.007 JavaScript

This PDF leverages the Collab.collectEmailInfo JavaScript function (CVE-2007-5659) to execute obfuscated JavaScript. The embedded JavaScript, after deobfuscation, contains a URL that is used to download a shellcode payload. The ML classifier and heuristic firings strongly indicate malicious intent, specifically targeting PDF vulnerabilities for remote code execution.

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` `9a510d9c7cec9918a33b2c3e062df04422d2e866f958afe4f52f86f8cd30391c`	pdf-javascript-stream	PDF /JS object 111711 at offset 0x18E	4139 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` `197e466cdf7e7b8abb06837e8935ac3b8ab8165943943cfd190744661a90d9c0`	pdf-javascript-stream	PDF /JS object 111712 at offset 0x11EF	17976 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_obj111713_002.js` `221d2b80cd5142b4ef664e4aac153de2c0ec815b9cffee8f2a5f5d3192d00eaf`	pdf-javascript-stream	PDF /JS object 111713 at offset 0x585D	1349 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` `5439b09c5a31c84ef1f17d69d12d2662bafe9e5f4479682c3899d612739c06e5`	pdf-javascript-stream	PDF /JS object 111711 at offset 0x1B2	23619 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` `ef56c3b22e482a8abb9f9755966e73cd02507bb1d85831e39940c6e2c3f9e856`	pdf-javascript-stream	PDF /JS object 111712 at offset 0x1213	19426 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` `a51094a3ad7b8733d72a58d5a20e871b02e7bfc4492e87e35097755a891c6992`	pdf-javascript-stream	PDF /JS object 111713 at offset 0x587F	1398 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` `3ce2f209b540fb36eed49cc31ae3f37f7cea4ebc079e3cbb3b999b83a97c1eae`	deobfuscated-js	multi-marker percent-array decoded JavaScript at offset 0x11EF	1469 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` `66201566cb7b94b96d78c07e61c80e11578b5125ea85cc864e3cc788698af3dd`	deobfuscated-js	multi-marker percent-array decoded JavaScript at offset 0x585D	79 bytes
`legacy_pdfkit_stage_002.js` `79309b29197edb84f42a6ee157e0d3ecc430bd28dff48f85ffad3a050372c41e`	deobfuscated-js	multi-marker percent-array decoded JavaScript at offset 0x1B2	1549 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` `2f2c9cad95eeecf3e7675fe759590ac8ace3326dbcb7b85d9489a1fd4a03e16c`	deobfuscated-js	multi-marker percent-array combined decoded JavaScript at offset 0x11EF	7829 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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