PDF malware analysis — malicious · 6d237fbec4f852b5

MALICIOUS

PDF

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

MD5: a1628c021fcacf4d4525915e36514b43 SHA-1: 7d3f87013000c76211ab08c7caff5c57de8eb98c SHA-256: 6d237fbec4f852b5180dae037da7d1bffeced1c0cb591f31299701334a92677c

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 known CVEs (CVE-2009-4324, CVE-2009-0927, CVE-2007-5659) via embedded JavaScript. The JavaScript is designed to download a second-stage payload from the URLs http://herewereytinj.com/tera/sv777/load.php?spl=pdf_new and http://herewereytinj.com/tera/sv777/load.php?spl=pdf_pack. The ML classifier also 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://herewereytinj.com/tera/sv777/load.php?spl=pdf_new
- http://herewereytinj.com/tera/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` `fb72c6c0386bfd1200731b22c75bc20d6509b5e0b55a1ef423dcb6485ad5884c`	pdf-javascript-stream	PDF /JS object 32 at offset 0x2FD	240 bytes
`javascript_obj0034_001.js` `838201c9f007b54e27c2d652a76ddab443d15f434d130c4e1de0d88936baecbc`	pdf-javascript-stream	PDF /JS object 34 at offset 0x3E8	357 bytes
`javascript_obj0036_002.js` `13bd88e9ecf31e3f4c2c4c4351c8a4b2527bc3b9d2794ffa615e92c1284bacb6`	pdf-javascript-stream	PDF /JS object 36 at offset 0xAC	196 bytes
`legacy_pdfkit_stage_000.js` `a83ef2e5135b0a1f318cc309883f78d75ddda0a26109b79528f7b832c4bbbe23`	deobfuscated-js	repeated-marker hex decoded JavaScript at offset 0x51C	1675 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` `39c9bd833cbbf0ea34221591edacb9b2de0fba2b69bcb0ab01498285c7a93a44`	deobfuscated-js	repeated-marker hex decoded JavaScript at offset 0xAB8	1833 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` `0cc6c1aceebc8b6b04e97072fc91c4c6a94299689bc720d7fa99cb10a97e712e`	deobfuscated-js	repeated-marker hex decoded JavaScript at offset 0x1039	3015 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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