PDF malware analysis — malicious · 6104a87702d066b6

MALICIOUS

PDF

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

MD5: cc0ddbce20b283a2ad7b68767e81d175 SHA-1: 4f15bd378edaf84b533fda630f9121b71b222b1f SHA-256: 6104a87702d066b627529ff2237f1c7457462c478a85190c0ee647ef612d7fd6

270 Risk Score

Malware Insights

MITRE ATT&CK

T1203 Exploitation for Client Execution T1059.007 JavaScript

The sample is a PDF file that leverages multiple known vulnerabilities (CVE-2009-4324, CVE-2009-0927, CVE-2007-5659) through embedded JavaScript. This JavaScript is designed to download and execute a second-stage payload from the URLs http://softinternational.net/Cvssce/load.php?spl=pdf_new and http://softinternational.net/Cvssce/load.php?spl=pdf_pack. The ML classifier strongly indicates maliciousness.

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://softinternational.net/Cvssce/load.php?spl=pdf_new
- http://softinternational.net/Cvssce/load.php?spl=pdf_pack

Extracted artifacts 6

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj0032_000.js` `486b7dc35bbc2774ccedf6d996e14646f57c7a7312323d14b2d5a0bae62e83bb`	pdf-javascript-stream	PDF /JS object 32 at offset 0x356	274 bytes
`javascript_obj0034_001.js` `3bb561aa32569ace1ada775d2d60672be1515fb8206de8bf61cc7b99e53f0e1f`	pdf-javascript-stream	PDF /JS object 34 at offset 0x44F	375 bytes
`javascript_obj0036_002.js` `de436ae546a2dff06df5eaf0d1c9de2310303192295f4ee75d73737632237acf`	pdf-javascript-stream	PDF /JS object 36 at offset 0xBC	254 bytes
`legacy_pdfkit_stage_000.js` `de0a84f644c282c4c2e84ff204cd581c0f7ea198155403bb40e5214bda4001a7`	deobfuscated-js	repeated-marker hex decoded JavaScript at offset 0x598	1676 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` `89747115a0c2859a29790bcc1302f256940ebf818804d9c0d37ad82490c82a9f`	deobfuscated-js	repeated-marker hex decoded JavaScript at offset 0xB44	1842 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` `959242c5d95abe63ae41f9ae34e2f25098d08c0d6eeafb64d65e7ecf1f3305f3`	deobfuscated-js	repeated-marker hex decoded JavaScript at offset 0x10D5	3022 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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