PDF malware analysis — malicious · 75495422a69ddf34

MALICIOUS

PDF

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

MD5: 191205d02bb532050f3a9a569dda2cb7 SHA-1: d067f19009d503e523af4b1c591d47769bc9e57c SHA-256: 75495422a69ddf346968985c67059a3fa52d6f8435b71fcb135099aae1f078d9

470 Risk Score

Malware Insights

MITRE ATT&CK

T1203 Exploitation for Client Execution T1059.007 JavaScript

The PDF file contains embedded JavaScript that exploits multiple known vulnerabilities including CVE-2009-4324, CVE-2009-0927, and CVE-2007-5659. The JavaScript is designed to download and execute a second-stage payload from the URLs http://kozzz.in/1/load.php?spl=pdf_new and http://kozzz.in/1/load.php?spl=pdf_pack. The presence of multiple exploit indicators and a high ML classifier score strongly suggest malicious intent.

Machine Learning

Nyx PDF Classifier malicious score 0.9998

Heuristics 12

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.
ClamAV: Pdf.Dropper.Agent-7273508-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Dropper.Agent-7273508-0
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/1/load.php?spl=pdf_new
- http://kozzz.in/1/load.php?spl=pdf_pack

Extracted artifacts 8

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj0032_000.js` `a60348dec9e66f89312cbefb2e922bb2d04aeca0239c480c7c141f03d9f05c5c`	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` `b78e88d956401a26d2adce573025f2fab1b9f222a1d5e3722f2b0fc1d94013e5`	pdf-javascript-stream	PDF /JS object 34 at offset 0x4D9	130 bytes
`javascript_obj0036_002.js` `92903fccbc2caf69efe0d348ad73f8300bcb2c9445816e915422ccc6ef1c9026`	pdf-javascript-stream	PDF /JS object 36 at offset 0x103	143 bytes
`javascript_obj0038_003.js` `dba618b6e1863fef73b3c84637b5dcae8e3b5860b8f0751ffdff2f7d4077035e`	pdf-javascript-stream	PDF /JS object 38 at offset 0xC3B	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` `3f83285705ce195b47d4db8a3c04ba8f35826e4857c69294a8d90b69809c965c`	pdf-javascript-stream	PDF /JS object 78 at offset 0x7C	41 bytes
`legacy_pdfkit_stage_000.js` `3088d9b77323678b8502bb9bb2b02ef3e188745f549dc90fc0bc7e398b7fe8eb`	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` `18db88491ef923151a51eab64ac2da9b54797279cd262da610d25c71b75cab0d`	deobfuscated-js	repeated-marker hex decoded JavaScript at offset 0xD6C	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` `c5ee9f4fb211241c30adc803c1d072e5075fffac11899f9d736c1176b3b55d03`	deobfuscated-js	repeated-marker hex decoded JavaScript at offset 0x13D2	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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