PDF malware analysis — malicious · 1430a78f79f09e02

MALICIOUS

PDF

8.0 KB Created: 2009-07-06 16:21:05 Authoring application: Leguavbotazi (via Lajimonejvjizapoo)

MD5: 238bdc458d8285cc247864a467be0e0c SHA-1: 40e79fd8f3720ad8838dc4b2b82020993d550f01 SHA-256: 1430a78f79f09e0288cc9935d47d6591bd2a43b0b879a0b33d8c2c270c3af4f1

468 Risk Score

Malware Insights

MITRE ATT&CK

T1203 Exploitation for Client Execution T1059.007 JavaScript

The PDF sample contains embedded JavaScript that leverages known vulnerabilities (CVE-2009-0927 and CVE-2007-5659) in Adobe Reader. The JavaScript is obfuscated but appears to be designed to download and execute a secondary payload. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

Nyx PDF Classifier malicious score 1.0000

Heuristics 11

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. (identified after JavaScript deobfuscation)
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. (identified after JavaScript deobfuscation)
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: Pdf.Exploit.Agent-35649 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Exploit.Agent-35649
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.
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.
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 9

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj0007_000.js` `b5900a1fdebc5dae37690e1fb5787269838b19cb47b6ed90bf27e238726a582b`	pdf-javascript-stream	PDF /JS object 7 at offset 0x608	6331 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 11 eval/decoder/string-building token(s).
`generic_stage_recovery_000.js` `5ec165eb5f3eec7d6cd0aafbcdc3be5b21f0414c76061be40ee880cfa8a38058`	deobfuscated-js	generic stage recovery split-literal-normalize from raw PDF metadata at offset 0x0	7964 bytes
Detection ClamAV: Pdf.Exploit.Agent-35649 Obfuscation or payload: likely Carved artifact contains 1 long base64-like blob(s).
`generic_stage_recovery_001.js` `16d2691f117dd44620a252f897a0d59a0d33349b711aacb06794893bd94893f0`	deobfuscated-js	generic stage recovery split-literal-normalize from JavaScript object 7 at offset 0x608	6103 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 11 eval/decoder/string-building token(s). Carved artifact contains 1 long base64-like blob(s).
`generic_stage_recovery_002.js` `9bffb4bb9582fe9fa67aad74fa32e79730bb93ac5c4b54b9c2d74251570ff752`	deobfuscated-js	generic stage recovery split-literal-normalize from decompressed stream at 0x1399 at offset 0x1399	2677 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 11 eval/decoder/string-building token(s). Carved artifact contains 1 long base64-like blob(s).
`generic_stage_recovery_003.js` `540288a8a38dd7ad0d32d699e4d033506428232459bb0aacfb35a221a107b34f`	deobfuscated-js	generic stage recovery split-literal-normalize -> percent-decode from raw PDF metadata at offset 0x0	7960 bytes
Detection ClamAV: Pdf.Exploit.Agent-35649 Obfuscation or payload: likely Carved artifact contains 1 long base64-like blob(s).
`generic_stage_recovery_004.js` `271aca2f453566ba677f1d0814af7803851cad4cd8c4e07b2518860ff706882d`	deobfuscated-js	generic stage recovery percent-decode -> split-literal-normalize from raw PDF metadata at offset 0x0	7962 bytes
Detection ClamAV: Pdf.Exploit.Agent-35649 Obfuscation or payload: likely Carved artifact contains 1 long base64-like blob(s).
`generic_stage_recovery_005.js` `d5f90c2df8ca066a23c62a56ce9f78612e0ca9acbc7d032585544c703fb73a13`	deobfuscated-js	generic stage recovery split-literal-normalize -> percent-decode from JavaScript object 7 at offset 0x608	6099 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 11 eval/decoder/string-building token(s). Carved artifact contains 1 long base64-like blob(s).
`generic_stage_recovery_006.js` `28b95f080ed2a14aea6844386da1d10a1a28a7803ccd452df82c1f165949870c`	deobfuscated-js	generic stage recovery percent-decode -> split-literal-normalize from JavaScript object 7 at offset 0x608	6101 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 11 eval/decoder/string-building token(s). Carved artifact contains 1 long base64-like blob(s).
`legacy_pdfkit_stage_000.js` `e02e2a3bae5c73bf215cd72464cd0cd24899c02b4725be7065c7303db8f7b64c`	deobfuscated-js	string-concatenation normalized Acrobat API aliases at offset 0x608	276 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 long base64-like blob(s).

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