PDF malware analysis — malicious · 13139a7447108404

MALICIOUS

PDF

18.4 KB

MD5: 6f01afaac9ef0f0745b6224f387ab6d1 SHA-1: 18daad4ac3af2d4b646dd85de9513611f49f8bc1 SHA-256: 13139a74471084049f3ffe99d840fdf369532072b5dcc67a8b97aa23a0ff43b3

310 Risk Score

Malware Insights

MITRE ATT&CK

T1203 Exploitation for Client Execution T1059.007 JavaScript

The sample is a PDF file that leverages JavaScript to exploit CVE-2009-4324. The obfuscated JavaScript, reconstructed from multiple concatenated strings, contains a URL that is used to download a second-stage payload. This is further supported by ClamAV detection of Js.Exploit.Shellcode-18 on an extracted artifact.

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` `f4946adcdc0c6380466b28cca9381b0d8819fe350efd9684113d20d14a61be9a`	pdf-javascript-stream	PDF /JS object 111711 at offset 0x18E	3223 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` `e0150deacc2daf980c36439b24fee6b7ac1f62eb9bee17ddac3cb45722267d63`	pdf-javascript-stream	PDF /JS object 111712 at offset 0xE5B	12683 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` `69c64d36501df50da98d991a7ab5b3f1f2d6ca00253eb682535f1e7814d5576e`	pdf-javascript-stream	PDF /JS object 111713 at offset 0x401C	2357 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` `bbd084d332803743361a23860f04bae42af218b32c3feec0b40e607106cf4902`	pdf-javascript-stream	PDF /JS object 111711 at offset 0x1B2	18419 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` `5f9b8866324906e104f502b645618f6b850f7e165b4a322752558d87c6993770`	pdf-javascript-stream	PDF /JS object 111712 at offset 0xE7F	15142 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` `0088622e61a9a34eab08e02ccc019989e0e81ad5ae10b202f4a2ab8a54b0bfb7`	pdf-javascript-stream	PDF /JS object 111713 at offset 0x403F	2406 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` `2a251c51c65ade356608bc796d756403c8787a534fc2c3f2b600ee2d664b9ddd`	deobfuscated-js	multi-marker percent-array decoded JavaScript at offset 0xE5B	1086 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` `50748b776f34cc4f59dec74d7cc1d331585af3cd1550e9ed0a0e0af86feae01c`	deobfuscated-js	multi-marker percent-array decoded JavaScript at offset 0x401C	175 bytes
`legacy_pdfkit_stage_002.js` `49d725f994f35b9b707df3b4519044a408b3de1d07c78737dd07cc64b6f1bfb7`	deobfuscated-js	multi-marker percent-array decoded JavaScript at offset 0x1B2	1262 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` `bb75e9dcc404af4de38d64eb5ad0b4e30a573be0ec3004f11bea9059a22706b0`	deobfuscated-js	multi-marker percent-array combined decoded JavaScript at offset 0xE5B	6490 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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