PDF malware analysis — malicious · 7864c500d1ce4625

MALICIOUS

PDF

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

MD5: a1f88a10871bd56eb48078541c20f6c1 SHA-1: f9776c9cbcc23d9879cf272f53756db1600b981b SHA-256: 7864c500d1ce4625ec86367599d1d7e8b4a83d984ac7f8afe89906b207246286

270 Risk Score

Malware Insights

MITRE ATT&CK

T1203 Exploitation for Client Execution T1059.007 JavaScript

The PDF file contains multiple critical heuristic firings indicating exploitation of CVE-2009-4324, CVE-2009-0927, and CVE-2007-5659 through embedded JavaScript. The JavaScript is designed to download a second-stage payload from the URLs http://webnomoney.com/tds/viewtop.php?spl=pdf_pack and http://webnomoney.com/tds/viewtop.php?spl=pdf_new. The ML classifier also strongly flagged this PDF as malicious.

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://webnomoney.com/tds/viewtop.php?spl=pdf_pack
- http://webnomoney.com/tds/viewtop.php?spl=pdf_new

Extracted artifacts 7

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj0032_000.js` `70421ab1a6ee349ff0e8b0cd61ada8b04728b5abb289ee6bab9cac1fa58e0490`	pdf-javascript-stream	PDF /JS object 32 at offset 0x360	187 bytes
`javascript_obj0034_001.js` `e0fbad4d37081f4d00e5a5a6c6472bce5df52aca5621d14ab8cc4130e11fe8a7`	pdf-javascript-stream	PDF /JS object 34 at offset 0x436	338 bytes
`javascript_obj0036_002.js` `9e923d1096ac32bb9eae566a7a7edab6673186316ccabcf6f3035d08cef81213`	pdf-javascript-stream	PDF /JS object 36 at offset 0xAC	214 bytes
`legacy_pdfkit_stage_000.js` `5c57408491ce593e20a0869de77d5f75a9552194dd1612bab124242f72e39136`	deobfuscated-js	repeated-marker hex decoded JavaScript at offset 0x568	1809 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` `b0631c8939576dcca33d3f1243f60ae2182a674c903fb7ff32a0ea19f8b066f1`	deobfuscated-js	repeated-marker hex decoded JavaScript at offset 0xB49	1657 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` `0aad5857d51c75469ee9aff4bb8870a9216c6244c873ac6011603ca1e2a3f36c`	deobfuscated-js	repeated-marker hex decoded JavaScript at offset 0x1153	2967 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).
`deobfuscated.js` `15775594a0eca7f0a6ca5b4c5616922192bb34ad2abd4f6e199261c4776c2d98`	deobfuscated-js	PDF JavaScript deobfuscation pass	63854 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 3 long base64-like blob(s).

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