PDF malware analysis — malicious · 83863d180ff1b670

MALICIOUS

PDF

17.3 KB

MD5: 8d7078b91440723ddba766b921c155d7 SHA-1: 4fe6507f0801ef34a4513c57b8345ea63d1995fa SHA-256: 83863d180ff1b6707fe55b08a51d5e8e48a8b69e4b7f0f21aa23754e940c8020

310 Risk Score

Malware Insights

MITRE ATT&CK

T1203 Exploitation for Client Execution T1059.007 JavaScript

This PDF file contains obfuscated JavaScript that exploits CVE-2009-4324 using the media.newPlayer function. The script is designed to download and execute 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 and array manipulation, indicates a deliberate attempt to obfuscate the malicious code.

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` `8c9cb61ae8f64b7339be7237fd63435baca210203be3ab449ee546230d6cecc6`	pdf-javascript-stream	PDF /JS object 111711 at offset 0x18E	2922 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` `d78d2f4eb66cf494211fd4c99c7f6cda8ebd335c850e756f3c77550cd583edd9`	pdf-javascript-stream	PDF /JS object 111712 at offset 0xD2E	12054 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` `231b8985b781a82329ca800557761aa3e24c5886052b1191624c8bfb79448ad7`	pdf-javascript-stream	PDF /JS object 111713 at offset 0x3C7A	2117 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` `7d19a26741c7da4059e2f8eaaaeb81a66ca048962222a2bf1bcbedd19c491ae2`	pdf-javascript-stream	PDF /JS object 111711 at offset 0x1B2	17249 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` `2721dfdc4fa569dceef73a034ec2dd7bdcebae5f777f5a75f77a8cd6ce570eef`	pdf-javascript-stream	PDF /JS object 111712 at offset 0xD52	14273 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` `053f4012e70acd84c6978ddcac120123d15efb5d4db944a5c8d5e54fbb9c91e6`	pdf-javascript-stream	PDF /JS object 111713 at offset 0x3C9D	2166 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` `77e31ee392e03e0109a99a651a1f965cc21f4a579111db265d7fa458cb9d2899`	deobfuscated-js	multi-marker percent-array decoded JavaScript at offset 0xD2E	1080 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` `767f92d7f680ccb2d6bf542ff03c4c4645442160ffa7db9ab34b066f1f2c8fd7`	deobfuscated-js	multi-marker percent-array decoded JavaScript at offset 0x3C7A	168 bytes
`legacy_pdfkit_stage_002.js` `e31d2d75aec1847119ac2c0ce51699b10dc2444c102230edf25c065070b3513e`	deobfuscated-js	multi-marker percent-array decoded JavaScript at offset 0x1B2	1249 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` `2d5f3be89e16bb2a9d8e13b873b178417ffc59dff8a474829c14a910e16079dc`	deobfuscated-js	multi-marker percent-array combined decoded JavaScript at offset 0xD2E	6418 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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