PDF malware analysis — malicious · 0fe03ecfd03245dc

MALICIOUS

PDF

4.3 KB Created: 2008-08-06 01:42:27 Authoring application: Scribus 1.3.3.12 (via Scribus PDF Library 1.3.3.12)

MD5: 7efca6528ea677723e3f5e2a806af3dd SHA-1: 5eb6b9eb617290812182d470bc86113b5c217083 SHA-256: 0fe03ecfd03245dc0ac8f94d568073c93487743f5ca276d9041a6b925581f0f3

308 Risk Score

Malware Insights

MITRE ATT&CK

T1059.007 JavaScript T1203 Exploitation for Client Execution T1566.001 Spearphishing Attachment

This PDF file contains embedded JavaScript that utilizes the unescape() function and exploits CVE-2008-2992 via util.printf. The JavaScript is heavily obfuscated and appears to be a downloader for a second-stage payload, as indicated by the ClamAV signature 'Js.Exploit.Shellcode-18' and the ML classifier's high confidence. The primary attack vector is likely spearphishing attachment.

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.
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 detection on extracted artifact critical EXTRACTED_FILE_CLAMAV

ClamAV flagged at least one file extracted from inside this sample. Even when the wrapping document carries no AV detection of its own, a hit on the carved artifact is a strong indicator the sample is a delivery vehicle.
unescape() call high PDF_UNESCAPE

unescape() found — often used to decode shellcode in PDF JS exploits
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.

Extracted artifacts 6

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj0013_001.js` `d9132406ac315c25f1fe33cdc31fb728bdfc7187518692bc832d0c456698cd6e`	pdf-javascript-stream	PDF /JS object 13 at offset 0x3DC	2777 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s). Carved artifact contains 1 long base64-like blob(s).
`javascript_obj0013_002.js` `db694a9d57ef98272da07b27fd7052020e575e6d29a8f71c98718949badf6ba1`	pdf-javascript-stream	PDF /JS object 13 at offset 0x402	3413 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s). Carved artifact contains 1 long base64-like blob(s).
`generic_stage_recovery_000.js` `33b680d89baeeedd5cc9ecd10d4e9fcc52bf8b3d63b1e41404992891cc097e0d`	deobfuscated-js	generic stage recovery split-literal-normalize from JavaScript object 13 at offset 0x3DC	2024 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s). Carved artifact contains 1 long base64-like blob(s).
`generic_stage_recovery_001.js` `f8b949ad58602e2470c12ba6ed8d8d4e452d0df558c0a377282a6ea0a68c7219`	deobfuscated-js	generic stage recovery split-literal-normalize from JavaScript object 13 at offset 0x402	2660 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s). Carved artifact contains 1 long base64-like blob(s).
`generic_stage_recovery_002.js` `22c324865c932c9bb226e8b928f9738c76733b9b197410622a26545b87a94a71`	deobfuscated-js	generic stage recovery split-literal-normalize from combined JavaScript objects at offset 0x11	4705 bytes
Detection ClamAV: Js.Exploit.Shellcode-18 Obfuscation or payload: likely Carved artifact contains 4 eval/decoder/string-building token(s). Carved artifact contains 2 long base64-like blob(s).
`combined_document_js_000.js` `3fe7324c85627d3bf9f53d194bbb1f15df57b0b67c38a7ad1a6ea45a494ff574`	deobfuscated-js	combined document JavaScript streams at offset 0x11	6211 bytes
Detection ClamAV: Js.Exploit.Shellcode-18 Obfuscation or payload: likely Carved artifact contains 4 eval/decoder/string-building token(s). Carved artifact contains 2 long base64-like blob(s).

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