PDF malware analysis — malicious · 0932b21ef87c569d

MALICIOUS

PDF

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

MD5: cb89c4aa8d5bf198fbf6c99fd66019f5 SHA-1: b31e1ff07a778b57c56adf78ec8ad3d0ae587e57 SHA-256: 0932b21ef87c569d378db1de5d71d1334a5ea98292fc358ed5df01a3465789ef

410 Risk Score

Malware Insights

MITRE ATT&CK

T1203 Exploitation for Client Execution T1059.007 JavaScript

The sample is a PDF file that leverages multiple JavaScript exploits (CVE-2009-4324, CVE-2009-0927, CVE-2007-5659) to execute arbitrary code. The embedded JavaScript contains URLs that are used to download a second-stage payload. The ML classifier also strongly indicates maliciousness.

Machine Learning

Nyx PDF Classifier malicious score 0.9998

Heuristics 11

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 exploit cluster critical PDF_JS_EXPLOIT_CLUSTER

PDF combines an executable JavaScript/action surface with exploit staging indicators such as eval/unescape/fromCharCode, XFA script content, or a related CVE pattern. Benign form JavaScript remains low-severity, but this correlated cluster is high-confidence malicious behavior.
eval() call high PDF_EVAL

eval() found — commonly used for obfuscated exploit execution (matched inside decoded stream)
unescape() call high PDF_UNESCAPE

unescape() found — often used to decode shellcode in PDF JS exploits (matched inside decoded stream)
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://kozzz.in/2/load.php?spl=pdf_new
- http://kozzz.in/2/load.php?spl=pdf_pack

Extracted artifacts 8

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj0032_000.js` `454b3dd7ec68a2c3817edac2f8d2755d84ad53a4cf5ec9ffde257d2c3d3b05bd`	pdf-javascript-stream	PDF /JS object 32 at offset 0x41D	131 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s).
`javascript_obj0034_001.js` `77bbeed2d474112873d6be8ed44456218d40a810ea422ba625a4a381a2a45c79`	pdf-javascript-stream	PDF /JS object 34 at offset 0x4D9	130 bytes
`javascript_obj0036_002.js` `296ea37fba5e68bf6530185bc65bfd61568e8ec4e925812ff052cc2728953256`	pdf-javascript-stream	PDF /JS object 36 at offset 0x103	143 bytes
`javascript_obj0038_003.js` `6aa8306d005b6e016edf4131187d7c84ded42a8e9a083bb00fa51207a0e1864e`	pdf-javascript-stream	PDF /JS object 38 at offset 0xC3A	166 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s).
`javascript_obj0078_004.js` `0dc5a0fb0a7a1f9c52306e8d9cccbe4d1312d317626c0dea09ac0e6725105510`	pdf-javascript-stream	PDF /JS object 78 at offset 0x7C	41 bytes
`legacy_pdfkit_stage_000.js` `b2e581467bf11f1cda7841f535399ca8cf5f18b4ea8a9b313116d79eb6dd6a58`	deobfuscated-js	repeated-marker hex decoded JavaScript at offset 0x5CA	1622 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` `8c3b226331a8a2d232a4cc72b974630e50e33b5f5de98e2fa80a3a31881fc4c2`	deobfuscated-js	repeated-marker hex decoded JavaScript at offset 0xD6B	1788 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` `067232e5360e076dc3d6d89d14ad6e56bd2606d96e516099987b41ec6705bbdf`	deobfuscated-js	repeated-marker hex decoded JavaScript at offset 0x13D1	2914 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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