PDF / .ORG malware analysis — malicious · 3779a648c33db972

MALICIOUS

PDF / .ORG

25.7 KB

MD5: 3ac3bce87e88cd64b4dca01a2f6d80a7 SHA-1: aebaeea48f90f46ff7d7ab1e8797cff5867daa8b SHA-256: 3779a648c33db9727136d5f532e6b12c7f76e8ed248a579b88c5f9f63a9d5017

118 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.001 Malicious Link

The PDF sample contains multiple embedded JavaScript streams, with one stream heavily obfuscated and utilizing eval() and unescape() functions. The CVE-2008-2992 heuristic indicates the exploitation of a known vulnerability in Adobe Reader via the util.printf() function, which is used to decode a second-stage payload. The deobfuscated JavaScript confirms the use of eval() and unescape() to construct and execute malicious code, likely for downloading and executing further stages.

Heuristics 5

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. (identified after JavaScript deobfuscation)
eval() call high PDF_EVAL

eval() found — commonly used for obfuscated exploit execution
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 6

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj111711_000.js` `cdb96e3041cd6ae05dd780872178aa2761b95072bb59f34bf0929616facb34ff`	pdf-javascript-stream	PDF /JS object 111711 at offset 0x18E	3401 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s). Carved artifact contains 6 long base64-like blob(s).
`javascript_obj111712_001.js` `a5105a4fdc0d38ddb464b651a38e0bd60abed6426beb540ee7dcc4dcb3fe7e95`	pdf-javascript-stream	PDF /JS object 111712 at offset 0xF0D	17243 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s). Carved artifact contains 4 long base64-like blob(s).
`javascript_obj111713_002.js` `67673d552d31e9d49faf6bde6dd30b69319cc494c4682a3d634bb0e173eeea6a`	pdf-javascript-stream	PDF /JS object 111713 at offset 0x529E	5038 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s). Carved artifact contains 6 long base64-like blob(s).
`legacy_pdfkit_stage_000.js` `bf1b059508b3af338941ab43c8317c37ca22b2b9e86abcfcca4138fe17431a05`	deobfuscated-js	multi-marker percent-array decoded JavaScript at offset 0xF0D	1420 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 3 eval/decoder/string-building token(s).
`legacy_pdfkit_stage_001.js` `34feebbbf0ee64a52f53dce0c98530b4b073203d6a605ba6fc0e3a735084f8c8`	deobfuscated-js	multi-marker percent-array decoded JavaScript at offset 0x529E	384 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 long base64-like blob(s).
`legacy_pdfkit_stage_002.js` `2cb3120c839524b64a3a48834ecb2bb6c9104acd116b7068ce52cc36c6606fc0`	deobfuscated-js	multi-marker percent-array combined decoded JavaScript at offset 0xF0D	1805 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 3 eval/decoder/string-building token(s). Carved artifact contains 1 long base64-like blob(s).

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