PDF malware analysis — malicious · 656738c7c5e9d8ad

MALICIOUS

PDF

13.5 KB

MD5: 77cf2f2a7c429773cfc9dd2481151b22 SHA-1: c84b75df37889164ae3bfb83178313983f89b1bd SHA-256: 656738c7c5e9d8add5b9c438ac98367c8ce88c32be49e9b74ccfaf607484d3f8

310 Risk Score

Malware Insights

MITRE ATT&CK

T1203 Exploitation for Client Execution T1059.007 JavaScript

The PDF file contains obfuscated JavaScript that exploits multiple Adobe Reader vulnerabilities, specifically CVE-2009-4324 and CVE-2009-0927. This JavaScript is designed to download and execute a second-stage payload from the provided URLs. The ML classifier strongly indicates maliciousness, and the embedded URLs are the primary indicators of compromise.

Machine Learning

Nyx PDF Classifier malicious score 1.0000

Heuristics 9

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)
Multi-CVE Adobe Reader JavaScript exploit kit critical PDF_ADOBE_READER_MULTI_CVE_JS_KIT

One recovered JavaScript stage contains multiple version-gated Adobe Reader exploit branches. This is stronger evidence than independent API keywords: the PDF is selecting old Reader vulnerabilities by viewer version and running heap-sprayed Acrobat JavaScript exploit paths.
Generic recovered JavaScript exploit stage high PDF_GENERIC_STAGE_RECOVERY

Bounded static stage recovery exposed hidden JavaScript through generic transforms such as null-byte collapse, percent decoding, marker replacement, arithmetic character codes, fromCharCode, numeric arrays, numeric-array minus-key decoders, alphabet-index arrays, /Producer half-difference metadata arrays, hex literals, marker-stripped Base64 literals, custom 6-bit XOR table decoders, or repeated-marker hex carriers. This rule is emitted only when the recovered stage contains exploit-like Acrobat JavaScript or shellcode markers.
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://91.228.133.56/dnsftrsn/ac16ab2fff6df42a7c42b0843916a3c4/d7.php?f=g
- http://91.228.133.56/dnsftrsn/ac16ab2fff6df42a7c42b0843916a3c4/d8.php?f=n

Extracted artifacts 3

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj0076_000.js` `c3ad7124b6f11cc1f44aaed8073abd458eb8607ac34cf0f5181c3691ee6529a9`	pdf-javascript-stream	PDF /JS object 76 at offset 0x38A	12743 bytes
`generic_stage_recovery_000.js` `f611ef698f84f58826dbea01c263fd3f36f5843761081a4ec2797a40fadbbca2`	deobfuscated-js	generic stage recovery alphabet-index-array from JavaScript object 76 at offset 0x38A	4469 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 6 eval/decoder/string-building token(s).
`generic_stage_recovery_001.js` `b3b358b9c0dfecc3651dc21c0ede49b5a7ee0c81edb733754e0efc941e56fe80`	deobfuscated-js	generic stage recovery percent-decode from JavaScript object 76 at offset 0x38A	4461 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 6 eval/decoder/string-building token(s).

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