PDF malware analysis — malicious · 7542445dac67b1e3

MALICIOUS

PDF

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

MD5: 8d1b063de8303673e598afcaccd7e789 SHA-1: d84ec79911d760b9c08d4a3f2d467bf81b6d04b1 SHA-256: 7542445dac67b1e338baf7571cd8f656720d1b60f5401556812cc46dd22c59ed

270 Risk Score

Malware Insights

MITRE ATT&CK

T1203 Exploitation for Client Execution T1059.007 JavaScript

The sample is a PDF file that contains multiple JavaScript streams exploiting known vulnerabilities to achieve code execution. The embedded JavaScript is designed to download a second-stage payload from the provided URLs. The ML classifier strongly indicates maliciousness, and the specific CVEs targeted confirm the exploitation vector.

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://internaj.us/1/sv777/load.php?spl=pdf_new
- http://internaj.us/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` `fe58b1d0085d5e36e1cf4d509a83a442ca1f50310859f13e4a32c1b8692d5fbd`	pdf-javascript-stream	PDF /JS object 32 at offset 0x2FC	240 bytes
`javascript_obj0034_001.js` `881f3cb301392d7bc42faaf75d3e2ddeb490f781f1882576da3ef2c5561d0b4b`	pdf-javascript-stream	PDF /JS object 34 at offset 0x3E7	357 bytes
`javascript_obj0036_002.js` `692d37d64f3456fcd0b1a4e1e6cfb8e7fa8d6085af76d2a2dcdbcc3b91b34ef0`	pdf-javascript-stream	PDF /JS object 36 at offset 0xAC	196 bytes
`legacy_pdfkit_stage_000.js` `6b712e3508e681cf65a551d954a6691ce07b5a69fcc55d89b3eca0f3845139c0`	deobfuscated-js	repeated-marker hex decoded JavaScript at offset 0x51B	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` `8c8ce7c0d307b3ac6c1b3a82451b3b2a2c6c93ee4b035553778d9920887f2d8e`	deobfuscated-js	repeated-marker hex decoded JavaScript at offset 0xAAD	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` `6d850e79f3940d96d27e555fdbfe5ace06a3a29885f780c85fbdc95bbb470d0b`	deobfuscated-js	repeated-marker hex decoded JavaScript at offset 0x101D	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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