PDF malware analysis — malicious · 6b0a3d2c4a9313bc

MALICIOUS

PDF

18.0 KB

MD5: f2fcfc698df05313d0e3fdc98d274256 SHA-1: 605e57bb6798295a52753875aefd4060bc96e6f1 SHA-256: 6b0a3d2c4a9313bc1a5924f3068a56c843a21a02605f130b4d6f684ebec9b951

310 Risk Score

Malware Insights

MITRE ATT&CK

T1203 Exploitation for Client Execution T1059.007 JavaScript

The PDF file contains obfuscated JavaScript that leverages CVE-2009-4324 to execute code. This script is designed to download a second-stage payload from the URL http://gospeltube.com/cache/.svn/.p2/.l.php?l=1&spl=pdf_newplayer. The use of eval() and unescape() functions, along with complex string concatenation, indicates a deliberate attempt to hide malicious activity. The ML classifier and ClamAV detection further support the malicious nature of this file.

Machine Learning

Nyx PDF Classifier malicious score 1.0000

Heuristics 9

media.newPlayer — CVE-2009-4324 critical CVE exact CVE_2009_4324

PDF JavaScript calls media.newPlayer — CVE-2009-4324 is a use-after-free in Adobe Reader's multimedia plugin triggered by media.newPlayer(). Actively exploited as a zero-day in December 2009. (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/.p2/.l.php?l=1&spl=pdf_newplayer

Extracted artifacts 10

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj111711_000.js` `dd1e9ed8e6b49657c40524fbe1301ee053af3c076d723eb64ffa9c664d31da34`	pdf-javascript-stream	PDF /JS object 111711 at offset 0x18E	3184 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` `4dcd335650413e332a55adaf530a4a88757b0dfbaabdbe034278027a1eaa52e9`	pdf-javascript-stream	PDF /JS object 111712 at offset 0xE34	12094 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` `7e4baa4c436ce6f12832a322f9b33bdce9ff15855742a02d075fdf7f9830b2bd`	pdf-javascript-stream	PDF /JS object 111713 at offset 0x3DA8	2567 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_obj111711_003.js` `a0b0b0fcbe977817c889fc986e388a0ea44511ea020f8423f4407bb1258fa4d1`	pdf-javascript-stream	PDF /JS object 111711 at offset 0x1B2	18001 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` `468033abd9f227e840205b6e205b3b2cb9b427792d26110b96202dd48836251c`	pdf-javascript-stream	PDF /JS object 111712 at offset 0xE58	14763 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` `1fe6104361550fa1522eb06b51d8e962644f8656285bd3172d75584d87b90938`	pdf-javascript-stream	PDF /JS object 111713 at offset 0x3DCB	2616 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).
`legacy_pdfkit_stage_000.js` `3b7a17bfba7e11af05b33ae287b5dd9ba1badc35990c00315a6a635b2cd29016`	deobfuscated-js	multi-marker percent-array decoded JavaScript at offset 0xE34	1084 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s).
`legacy_pdfkit_stage_001.js` `7eb946efe7a632d0999c8fc7543cf8bd8be184431c03fa2b9d6114e97ff3006f`	deobfuscated-js	multi-marker percent-array decoded JavaScript at offset 0x3DA8	169 bytes
`legacy_pdfkit_stage_002.js` `30cb0d3f9ac2ef8daee48c2fe7dc1c19035bd4414c24447890816ec8e6bd570b`	deobfuscated-js	multi-marker percent-array decoded JavaScript at offset 0x1B2	1254 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s).
`legacy_pdfkit_stage_003.js` `0c09939652c46a1b0d919154ec9eae0cce80ea801abe24a3751fbd98ba663450`	deobfuscated-js	multi-marker percent-array combined decoded JavaScript at offset 0xE34	6444 bytes
Detection ClamAV: Js.Exploit.Shellcode-18 Obfuscation or payload: likely Carved artifact contains 10 eval/decoder/string-building token(s).

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