PDF malware analysis — malicious · 0339e48f82a1c26b

MALICIOUS

PDF

5.9 KB Created: 2009-01-35 62:12:26 Authoring application: Adobe

MD5: 73844c4dfa662c7a8d092d27b7507c50 SHA-1: 5a31fb2e5d4ecf5d04e55f1fed319ea58b0e76f6 SHA-256: 0339e48f82a1c26b25230376737eebce639788643317389094d69390db987bda

270 Risk Score

Malware Insights

MITRE ATT&CK

T1203 Exploitation for Client Execution T1059.007 JavaScript

The PDF sample contains multiple critical heuristic firings indicating exploitation of known CVEs related to PDF JavaScript execution. The embedded JavaScript is designed to download a second-stage payload from the provided URLs. The ML classifier also strongly flagged this PDF as malicious, supporting the conclusion that it is a downloader for further malicious activity.

Machine Learning

Nyx PDF Classifier malicious score 1.0000

Heuristics 8

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)
Collab.getIcon — CVE-2009-0927 critical CVE exact CVE_2009_0927

PDF JavaScript calls Collab.getIcon — CVE-2009-0927 is a stack buffer overflow in Adobe Reader triggered by Collab.getIcon() with a crafted argument. Allows arbitrary code execution. (identified after JavaScript deobfuscation)
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 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://thintin.com/1/sv777/load.php?spl=pdf_new
- http://thintin.com/1/sv777/load.php?spl=pdf_pack

Extracted artifacts 6

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj0032_000.js` `9f891953a2c5ab89a3e3741fe4c53ad93fa4610e40df84ffa3e714de2ca0d72d`	pdf-javascript-stream	PDF /JS object 32 at offset 0x2F5	238 bytes
`javascript_obj0034_001.js` `f4d0acb086fc14b85baf477c913111010c8add2549c67f0abba4f29a5fa3d613`	pdf-javascript-stream	PDF /JS object 34 at offset 0x3D8	337 bytes
`javascript_obj0036_002.js` `4916b476037a7007e6cfd3345f437fbb32904100571aba7cc815180c03801714`	pdf-javascript-stream	PDF /JS object 36 at offset 0xAC	184 bytes
`legacy_pdfkit_stage_000.js` `8eeeea4e231fe3ba8b79434c13d2000ed00c1f5a9b039090f0a07e8f3d940d1b`	deobfuscated-js	repeated-marker hex decoded JavaScript at offset 0x508	1651 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` `2744ae0eea65d75a9302c7d99ae16814ae90ce5f83379899eaae40106cf446a0`	deobfuscated-js	repeated-marker hex decoded JavaScript at offset 0xA98	1803 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 3 eval/decoder/string-building token(s).
`legacy_pdfkit_stage_002.js` `721f67b3bdb69c48ca68104f925923a6e9d73a6161991616a4218a741337c341`	deobfuscated-js	repeated-marker hex decoded JavaScript at offset 0x1003	2955 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 6 eval/decoder/string-building token(s). Carved artifact contains 1 long base64-like blob(s).

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