PDF malware analysis — malicious · 024495b34b9accfe

MALICIOUS

PDF

2.7 KB Created: 8953-01-01 Authoring application: 8877

MD5: 51b0dc6eba7c907d54759b5af853febd SHA-1: dfe970b4356a17311874e31ea5eed3188fc9b039 SHA-256: 024495b34b9accfe04e32601984f801e2cc6815e19e372cf2bb1b4c23b5d2a9b

648 Risk Score

Malware Insights

MITRE ATT&CK

T1203 Exploitation for Client Execution T1059.007 JavaScript

This PDF file contains JavaScript that exploits multiple known vulnerabilities in Adobe Reader, including CVE-2009-0927, CVE-2007-5659, and CVE-2008-2992. The embedded JavaScript is designed to download and execute a second-stage payload from the URL http://webzarabotok.ax3.net/load.php?stat=Windows. The use of eval() and unescape() functions indicates obfuscation, typical of exploit kits.

Machine Learning

Nyx PDF Classifier malicious score 1.0000

Heuristics 15

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. (matched in decompressed stream)
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: Pdf.Exploit.Agent-36014 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Exploit.Agent-36014
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)
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).
Suspicious extracted artifact medium 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.
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.
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://webzarabotok.ax3.net/load.php?stat=Windows

Extracted artifacts 12

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj0013_001.js` `ada870f5c0a5e449a3c616ab892cf57fc6ac650eccbf7917ab05de412ce7dd8b`	pdf-javascript-stream	PDF /JS object 13 at offset 0x328	4790 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 10 eval/decoder/string-building token(s). Carved artifact contains 3 long hex-escaped blob(s).
`generic_stage_recovery_000.js` `e4d6f5c9d0ef6f08f9c28cc4585f4b3e4c074abbf2f9dfb72290a951f57dd208`	deobfuscated-js	generic stage recovery split-literal-normalize from JavaScript object 13 at offset 0x328	4770 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 10 eval/decoder/string-building token(s). Carved artifact contains 3 long hex-escaped blob(s).
`generic_stage_recovery_001.js` `e389452ae7483c4ef9b44b487037393d6a7d898b6fc4fb8e3831337882c02c1c`	deobfuscated-js	generic stage recovery percent-decode from JavaScript object 13 at offset 0x328	3926 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 12 eval/decoder/string-building token(s).
`generic_stage_recovery_002.js` `c96671c235b030b0268793a7a177aee1ca00ffcf9e6bda54230a917af3bdc4fb`	deobfuscated-js	generic stage recovery split-literal-normalize from combined JavaScript objects at offset 0x9	4781 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 10 eval/decoder/string-building token(s). Carved artifact contains 3 long hex-escaped blob(s).
`generic_stage_recovery_003.js` `f32b9679bd50014b390256c64b9af6ffdb168572272e8dcdf9411db6a2f035a0`	deobfuscated-js	generic stage recovery percent-decode from combined JavaScript objects at offset 0x9	3937 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 12 eval/decoder/string-building token(s).
`generic_stage_recovery_004.js` `1cba2f5345b124665ce7231c6d728c8b82dae2bda91518c4759fc40fff7cfb4a`	deobfuscated-js	generic stage recovery percent-decode from decompressed stream at 0x328 at offset 0x328	3692 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 12 eval/decoder/string-building token(s).
`generic_stage_recovery_005.js` `16a022ecd8db9216076719ab63d4622cce8ce2cca5b943c7ce05fc28bc684d79`	deobfuscated-js	generic stage recovery split-literal-normalize -> percent-decode from JavaScript object 13 at offset 0x328	3906 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 12 eval/decoder/string-building token(s).
`generic_stage_recovery_006.js` `e3983e99ca938bff52a4ff7138e48183dbe599a9a1a8ba0fffbe1ec0d360ad3e`	deobfuscated-js	generic stage recovery percent-decode -> percent-decode from JavaScript object 13 at offset 0x328	3922 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 12 eval/decoder/string-building token(s).
`generic_stage_recovery_007.js` `4f97eff0c9e7c5cca650d78a85b04f4a95c6533dda9390402b9829c8b4c25dab`	deobfuscated-js	generic stage recovery split-literal-normalize -> percent-decode from combined JavaScript objects at offset 0x9	3917 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 12 eval/decoder/string-building token(s).
`generic_stage_recovery_008.js` `d107ebf9b37bea26713a39726142c20ff56ceff8d8d895db4f4577a6a82bd6c5`	deobfuscated-js	generic stage recovery percent-decode -> percent-decode from combined JavaScript objects at offset 0x9	3933 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 12 eval/decoder/string-building token(s).
`generic_stage_recovery_009.js` `65a1a27b0d753f2f44d8ab1e2a290032548617f42b36784c03d16ab4fb2e9a6a`	deobfuscated-js	generic stage recovery split-literal-normalize -> percent-decode -> percent-decode from JavaScript object 13 at offset 0x328	3902 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 12 eval/decoder/string-building token(s).
`generic_stage_recovery_010.js` `9dee71c1e286e847304ecd426891f9e05cae9a5e044b69757fb6254ed979afde`	deobfuscated-js	generic stage recovery split-literal-normalize -> percent-decode -> percent-decode from combined JavaScript objects at offset 0x9	3913 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 12 eval/decoder/string-building token(s).

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