PDF malware analysis — malicious · 756085a3f1a158cf

MALICIOUS

PDF

2.7 KB Created: 9468-01-01 Authoring application: 7851

MD5: a12c272c9622857173412d45568d70f9 SHA-1: 1cae3fdf412ca7b6ac703d0c14dfaa5ec4bf46ea SHA-256: 756085a3f1a158cfb01c7296f93dac6fb16deaceeefe6e4f7cb84c9b09d4a472

688 Risk Score

Malware Insights

MITRE ATT&CK

T1059.007 JavaScript T1203 Exploitation for Client Execution

This PDF file contains obfuscated JavaScript that exploits multiple known vulnerabilities in Adobe Reader, including CVE-2009-0927, CVE-2007-5659, and CVE-2008-2992. The script is designed to download and execute a second-stage payload from the URL http://webzarabotok.ax3.net/load.php?stat=Windows, indicating a downloader or exploit kit.

Machine Learning

Nyx PDF Classifier malicious score 1.0000

Heuristics 16

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
Hex-obfuscated structural name object high PDF_OBFUSCATED_NAME_OBJECT

A structurally-dangerous PDF name (e.g. /OpenAction, /Launch, /AA, /EmbeddedFile, /SubmitForm) is written with #XX hex escapes to evade string-based scanners. Legitimate producers write these names literally; hex-encoding them is a deliberate obfuscation technique.
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` `6f044bf08b1f1b2d5cd6b8e791b9b8e7a86801d32da35d7140fe08214fc50ab9`	pdf-javascript-stream	PDF /JS object 13 at offset 0x328	4812 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` `0a8ab2adf02c801453104fda8f148352f22698202f54d4cfc5b6e0fd60f126ef`	deobfuscated-js	generic stage recovery split-literal-normalize from JavaScript object 13 at offset 0x328	4792 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` `1478fa19f515378585253ef810f88d95e453900e47c82a43354055d9495f6532`	deobfuscated-js	generic stage recovery percent-decode from JavaScript object 13 at offset 0x328	3934 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` `6a9ebdddcf0aaa675c26cf4b32226b8b000e7d63c759465e217c076fbcd2f24b`	deobfuscated-js	generic stage recovery split-literal-normalize from combined JavaScript objects at offset 0x9	4803 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` `9fbba554459e9ccca130983f217b8cf786ac5985598e609b07ed5e1d766fe1a5`	deobfuscated-js	generic stage recovery percent-decode from combined JavaScript objects at offset 0x9	3945 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` `3655b67b6bed0776124d15034579c1d9f2a6349fa65f18a3d756a5c6c70ed115`	deobfuscated-js	generic stage recovery percent-decode from decompressed stream at 0x328 at offset 0x328	3700 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` `512d22701413fabca64c51e81dedc90b4d175cddb66bd6501b55b805d5cbbabd`	deobfuscated-js	generic stage recovery split-literal-normalize -> percent-decode from JavaScript object 13 at offset 0x328	3914 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` `1b04bfb92d24854e2cbdccd44b403be712c7eff6606fb10e9c07848300fb9d32`	deobfuscated-js	generic stage recovery percent-decode -> percent-decode from JavaScript object 13 at offset 0x328	3930 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` `d1e00c9fcd149a09fb8d04db3b7b1e8a7614df6b26d9bee16f68373ff3fb90f1`	deobfuscated-js	generic stage recovery split-literal-normalize -> percent-decode from combined JavaScript objects at offset 0x9	3925 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` `effc26636a36edf914a3def50b63b4b82c99f963e913dc7d95319534000cff2f`	deobfuscated-js	generic stage recovery percent-decode -> percent-decode from combined JavaScript objects at offset 0x9	3941 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` `9ce97e80ea63eaaee0b91c00cc545bc02c3f62ae0fd6d8e0795586c1e939cf98`	deobfuscated-js	generic stage recovery split-literal-normalize -> percent-decode -> percent-decode from JavaScript object 13 at offset 0x328	3910 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` `6230c9c58da09e66d3dfe492cc825ab5255f52943678ab7b2f3a2c4413e43671`	deobfuscated-js	generic stage recovery split-literal-normalize -> percent-decode -> percent-decode from combined JavaScript objects at offset 0x9	3921 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 12 eval/decoder/string-building token(s).

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