PDF malware analysis — malicious · 611907a634079e73

MALICIOUS

PDF

22.4 KB

MD5: 2990164e7189229622d2bd4df270ca12 SHA-1: 80738bb68bc1e91dd4ea7ce4313a815638302ff4 SHA-256: 611907a634079e73cb89ee5fdcc26f0474447b90a0a77ced9592afba41c303d6

310 Risk Score

Malware Insights

MITRE ATT&CK

T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF file contains obfuscated JavaScript that leverages the CVE-2007-5659 vulnerability (Collab.collectEmailInfo) to execute arbitrary code. This script is designed to download a second-stage payload from the URL http://gospeltube.com/cache/.svn/.p/.l.php?l=1&spl=pdf_collab_email. The use of eval() and unescape() functions, along with complex string concatenation and encoding, indicates a deliberate attempt to hide malicious activity.

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` `8136b69c6ad61fa65dd976cda768d33226829c9f6cd234e6f34f6d7b97ba07da`	pdf-javascript-stream	PDF /JS object 111711 at offset 0x18E	3573 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s). Carved artifact contains 4 long base64-like blob(s).
`javascript_obj111712_001.js` `1c620c14c727e0eb188a397e5354659c773233b4e514cef0e351b3e4014e17a1`	pdf-javascript-stream	PDF /JS object 111712 at offset 0xFB9	17204 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s). Carved artifact contains 4 long base64-like blob(s).
`javascript_obj111713_002.js` `2ddecd86789f520f8f7b0932425f464b8375363d95a2317d5547fea119a7f9ed`	pdf-javascript-stream	PDF /JS object 111713 at offset 0x5323	1548 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` `91dacda9135d89b92f320210625c5d1d035204bac38b7eaee0fd1df4e8005c32`	pdf-javascript-stream	PDF /JS object 111711 at offset 0x1B2	22480 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 3 eval/decoder/string-building token(s). Carved artifact contains 14 long base64-like blob(s).
`javascript_obj111712_004.js` `da47fea58e7a6c9062b87719804ce80ef095ea98bf04068b0c976a904068ef4a`	pdf-javascript-stream	PDF /JS object 111712 at offset 0xFDD	18853 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` `9fb79bbb7070883e40ad2d81af2fa57fcb3897d6290c9c4f1a0c2c403f6a2e29`	pdf-javascript-stream	PDF /JS object 111713 at offset 0x5345	1597 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 0xFB9	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` `3b9c12f73b4bcfe2d28986fa39e48678251e5d9bc785bff7338a9d4e23edeab2`	deobfuscated-js	multi-marker percent-array decoded JavaScript at offset 0x5323	87 bytes
`legacy_pdfkit_stage_002.js` `0ea5c4120abc8f4dc5e86af499c48aa85157a474d88e6583af24b992cbbbe08c`	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` `d83283914ccc5c7d40b37e196e19caaadfe5209aaf54831736a20d9422c671cf`	deobfuscated-js	multi-marker percent-array combined decoded JavaScript at offset 0xFB9	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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