PDF malware analysis — malicious · 82d85f8b1d4f8b35

MALICIOUS

PDF

4.8 KB Created: 2010-06-23 08:46:37 Authoring application: Scribus 1.3.3.13svn (via Scribus PDF Library 1.3.3.13svn)

MD5: 9b93c42ed9398780a069794cde977413 SHA-1: b4a091698ade4f5cf329c4e821aa2c344ec649f9 SHA-256: 82d85f8b1d4f8b350f7ed76d71b4abbab4896eca595be594280795c93d866d35

250 Risk Score

Malware Insights

MITRE ATT&CK

T1203 Exploitation for Client Execution T1059.007 JavaScript

This PDF sample contains JavaScript that leverages the CVE-2008-2992 vulnerability (util.printf). The script is designed to download and execute a second-stage payload, as indicated by the shellcode strings and the reference to metasploit.com. The ML classifier strongly indicates maliciousness.

Machine Learning

Nyx PDF Classifier malicious score 1.0000

Heuristics 8

util.printf — CVE-2008-2992 critical CVE exact CVE_2008_2992

PDF JavaScript calls util.printf() — CVE-2008-2992 is a stack buffer overflow in Adobe Reader triggered by a long format-specifier argument. Widely exploited in the wild after disclosure. (matched in decompressed stream)
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.
unescape() call high PDF_UNESCAPE

unescape() found — often used to decode shellcode in PDF JS exploits (matched inside decoded stream)
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.
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://metasploit.com

Extracted artifacts 4

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj0013_001.js` `be2d577f2e6866b94afcbb47b81e98327813feed207ced590a87991a41b20bf8`	pdf-javascript-stream	PDF /JS object 13 at offset 0x947	6352 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 3 eval/decoder/string-building token(s). Carved artifact contains 1 long base64-like blob(s).
`generic_stage_recovery_000.js` `20916a48c9a543bd392335ee388d2e56f383ab8bfa4d7e15a4549ca7c292347f`	deobfuscated-js	generic stage recovery split-literal-normalize from JavaScript object 13 at offset 0x947	4337 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 3 eval/decoder/string-building token(s). Carved artifact contains 1 long base64-like blob(s).
`generic_stage_recovery_001.js` `09368c359c3473fbc5d041316aeb8c04f88c2bc33608a704df02225502dcf857`	deobfuscated-js	generic stage recovery split-literal-normalize from combined JavaScript objects at offset 0xF	4352 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 3 eval/decoder/string-building token(s). Carved artifact contains 1 long base64-like blob(s).
`combined_document_js_000.js` `5e0b9c8533a667a1699e799956afe690e46ed8f861c08e415141c62612010034`	deobfuscated-js	combined document JavaScript streams at offset 0xF	6367 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 3 eval/decoder/string-building token(s). Carved artifact contains 1 long base64-like blob(s).

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