PDF malware analysis — malicious · 62db14fb453b0e8c

MALICIOUS

PDF

2.7 KB Created: 9231-01-01 Authoring application: 95

MD5: 77aed654e60ed85215f4aa20ceb22538 SHA-1: 1c1c5ad6fe8f6bfdd1f985594cb04dcdd00899ca SHA-256: 62db14fb453b0e8c29620f8efb6710f2b50f6ebb93468bbe1f557be6a424daf3

648 Risk Score

Malware Insights

MITRE ATT&CK

T1203 Exploitation for Client Execution T1059.007 JavaScript

This PDF file contains embedded JavaScript that exploits multiple known vulnerabilities in Adobe Reader, including CVE-2009-0927, CVE-2007-5659, and CVE-2008-2992. The JavaScript is heavily obfuscated but ultimately attempts to download and execute a second-stage payload from the URL http://zarplata.ax3.net/load.php?stat=Windows. The presence of multiple exploit signatures and the clear download URL indicate a high likelihood of malicious intent.

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://zarplata.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` `a83cb0c87db22b911028d6730b5daf7c7b7b4edf8d880e5d935c699d4952c27c`	pdf-javascript-stream	PDF /JS object 13 at offset 0x328	4771 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` `7174256a1580a12d63a5b873d1438cf6afd8c4f00df3ea0d5f9c18f111f6d877`	deobfuscated-js	generic stage recovery split-literal-normalize from JavaScript object 13 at offset 0x328	4751 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` `674ca7c4b9f7ff2b1ac2218049c501d82301d279a8f0a347ffc1c268bac61fb8`	deobfuscated-js	generic stage recovery percent-decode from JavaScript object 13 at offset 0x328	3907 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` `5ed129b5f3943f55ea59ff56a2e2a4a5c965122a01020640ea92607be05f1779`	deobfuscated-js	generic stage recovery split-literal-normalize from combined JavaScript objects at offset 0x9	4762 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` `126cd76817b3af45d14aae79825cdb3d59fa4dd961f85d4ea84b49327a268879`	deobfuscated-js	generic stage recovery percent-decode from combined JavaScript objects at offset 0x9	3918 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` `a99e6304c060e4abe066e415c150c92d4703f3f6e4dfc91739b21b4ee34c73ef`	deobfuscated-js	generic stage recovery percent-decode from decompressed stream at 0x328 at offset 0x328	3673 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` `58638254ac8b490a22a4ed8b0ed3429f32bdef00f8c01e27e328ac6ec4cbfc07`	deobfuscated-js	generic stage recovery split-literal-normalize -> percent-decode from JavaScript object 13 at offset 0x328	3887 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` `995106d225428ea8340bd09b8d1f169d14f3a983cc0534b55cb3fe5cd4c2a3f8`	deobfuscated-js	generic stage recovery percent-decode -> percent-decode from JavaScript object 13 at offset 0x328	3903 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` `bbaf39be6608ae69f773e62cbcf9c52c430bb5a8126fd820daa145bdf758b4c5`	deobfuscated-js	generic stage recovery split-literal-normalize -> percent-decode from combined JavaScript objects at offset 0x9	3898 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` `75cfd894a9b3d998b147fe11f956fff45be1691d9e75c75f770314679792aa2d`	deobfuscated-js	generic stage recovery percent-decode -> percent-decode from combined JavaScript objects at offset 0x9	3914 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` `5fcc94c66be9cc0cbbb90bf7540a793826a57493789987b7867948398e4b9d9f`	deobfuscated-js	generic stage recovery split-literal-normalize -> percent-decode -> percent-decode from JavaScript object 13 at offset 0x328	3883 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` `d61331b9eee450afdc92b5a7ccbed64f82aec77c839881c0d79d1b1e582ec444`	deobfuscated-js	generic stage recovery split-literal-normalize -> percent-decode -> percent-decode from combined JavaScript objects at offset 0x9	3894 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 12 eval/decoder/string-building token(s).

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