PDF malware analysis — malicious · 82b94f86ce4add0c

MALICIOUS

PDF

4.7 KB Created: 2008-31-20 53:85:00 Authoring application: Scribus 1.3.3.12 (via Scribus PDF Library 1.3.3.12)

MD5: 33aad9fd2d72ef951e2937ea39cd7ea6 SHA-1: 570ce446240bd710f66c8c27290c866b89df4c97 SHA-256: 82b94f86ce4add0cdd7798fe2f139102cf843ef6e723d3c78016419c81011616

548 Risk Score

Malware Insights

MITRE ATT&CK

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

This PDF file contains heavily obfuscated JavaScript that exploits multiple known vulnerabilities in Adobe Reader, specifically CVE-2007-5659 (Collab.collectEmailInfo) and CVE-2008-2992 (util.printf). The script is designed to execute arbitrary code, indicating it serves as a dropper for a secondary malicious payload. The ClamAV detection of 'Win.Trojan.Agent-36168' further supports its malicious nature.

Machine Learning

Nyx PDF Classifier malicious score 1.0000

Heuristics 12

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. (matched in decompressed stream)
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)
Pidief-style multi-CVE JavaScript dispatcher critical CVE likely PDF_PIDIEF_MULTI_CVE_DISPATCH

A single JavaScript body branches on app.viewerVersion and invokes two or more of the canonical Reader sinks (Collab.collectEmailInfo, Collab.getIcon, util.printf with a field-width format string). This is the 2009-2010 Pidief.J multi-exploit landing template: a per-version dispatcher that fires the matching CVE chain for whichever Reader version opens the file.
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.
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.
ClamAV: Win.Trojan.Agent-36168 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Win.Trojan.Agent-36168
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 (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.

Extracted artifacts 8

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj0013_001.js` `dfaf028744d31f8d9aeec18dd56e3c9a7964db7b2a7a66d37fdb06108e598c62`	pdf-javascript-stream	PDF /JS object 13 at offset 0x3FD	12677 bytes
Detection ClamAV: Win.Trojan.Agent-36168 Obfuscation or payload: likely Carved artifact contains 6 eval/decoder/string-building token(s).
`generic_stage_recovery_000.js` `d9f90d4869b619dedd7ec803f79d1d97b4d6c3b69c532fc4a98d114716ae52b7`	deobfuscated-js	generic stage recovery split-literal-normalize from JavaScript object 13 at offset 0x3FD	12590 bytes
Detection ClamAV: Win.Trojan.Agent-36168 Obfuscation or payload: likely Carved artifact contains 6 eval/decoder/string-building token(s).
`generic_stage_recovery_001.js` `f9d92ec7b47195f58320f9520a45761a6e5e50dfd29e80a02b0f7fe08aba4198`	deobfuscated-js	generic stage recovery percent-decode from JavaScript object 13 at offset 0x3FD	12675 bytes
Detection ClamAV: Win.Trojan.Agent-36168 Obfuscation or payload: likely Carved artifact contains 6 eval/decoder/string-building token(s).
`generic_stage_recovery_002.js` `2a59a13dc20f920d2ed0b9c0aea2d365c40054f6c397069c9632eb67a1cd6faa`	deobfuscated-js	generic stage recovery split-literal-normalize from combined JavaScript objects at offset 0xD	12605 bytes
Detection ClamAV: Win.Trojan.Agent-36168 Obfuscation or payload: likely Carved artifact contains 6 eval/decoder/string-building token(s).
`generic_stage_recovery_003.js` `b6c73e5a5104a62e7ffe45b25627113dd53fa0bc16f7cb0a0632f7490adb1047`	deobfuscated-js	generic stage recovery percent-decode from combined JavaScript objects at offset 0xD	12690 bytes
Detection ClamAV: Win.Trojan.Agent-36168 Obfuscation or payload: likely Carved artifact contains 6 eval/decoder/string-building token(s).
`generic_stage_recovery_004.js` `40aaab38d5857743f8b4527bb62ff12a1e84aee861feb9c8e681ce4fb3abdd4a`	deobfuscated-js	generic stage recovery split-literal-normalize -> percent-decode from JavaScript object 13 at offset 0x3FD	12588 bytes
Detection ClamAV: Win.Trojan.Agent-36168 Obfuscation or payload: likely Carved artifact contains 6 eval/decoder/string-building token(s).
`generic_stage_recovery_005.js` `72bd8313b62cbfdf639470572ffd34807346b4f9869c28630afc29aa6597bb65`	deobfuscated-js	generic stage recovery split-literal-normalize -> percent-decode from combined JavaScript objects at offset 0xD	12603 bytes
Detection ClamAV: Win.Trojan.Agent-36168 Obfuscation or payload: likely Carved artifact contains 6 eval/decoder/string-building token(s).
`combined_document_js_000.js` `0cc721c776ea3fcd9a5e58791c0d39353a3bbb64346af24319ae676807ea326c`	deobfuscated-js	combined document JavaScript streams at offset 0xD	12692 bytes
Detection ClamAV: Win.Trojan.Agent-36168 Obfuscation or payload: likely Carved artifact contains 6 eval/decoder/string-building token(s).

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