PDF malware analysis — malicious · b6fbc8ff623ab8f1

MALICIOUS

PDF

21.3 KB

MD5: c2a7d82d2a2770dd8a0fada971e2b2d0 SHA-1: 93327445fdc13ef57a08207710fbb383bd2e131b SHA-256: b6fbc8ff623ab8f15695c645182d61992bf001529e2304cf2bd6d7a0e927012a

118 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.001 Malicious Link

The PDF sample contains multiple embedded JavaScript streams, with a critical heuristic identifying the use of CVE-2007-5659 (Collab.collectEmailInfo). The JavaScript is heavily obfuscated using string concatenation and eval() calls, but the core functionality appears to be the execution of a second-stage payload. The reconstructed string 'v' + 'ar' + 'hm110791' + ' = ' + 'eval' indicates the use of eval for code execution. The presence of multiple obfuscated JavaScript files and the specific CVE exploit strongly suggest a malicious intent to compromise the user's system.

Heuristics 5

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)
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` `8f58ba490fd6472a5a8a84bc924345aed2eb1e897c2abec8a41138da12fff69d`	pdf-javascript-stream	PDF /JS object 111711 at offset 0x18E	3672 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` `a751c24adbca25c0321e10eb8f8baddb1647cfa87b822de7ace66c5af1f1f4bd`	pdf-javascript-stream	PDF /JS object 111712 at offset 0x101C	15995 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` `e454d0e9176a457358765d244945b5e56a488fa2944c890618869f7ab399e27d`	pdf-javascript-stream	PDF /JS object 111713 at offset 0x4ECD	1533 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` `e1ef57e355b39268ad264cc25028a9a0e38b4699b467c94913104d44e9e6dafc`	deobfuscated-js	multi-marker percent-array decoded JavaScript at offset 0x101C	1470 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` `27b3ec0bf3195ff786a53fe212587ee83c501c6044ca596633e38af46a7eb99c`	deobfuscated-js	multi-marker percent-array decoded JavaScript at offset 0x4ECD	84 bytes
`legacy_pdfkit_stage_002.js` `b45d4727dfbc55f315d68369649c305933823afb72560ff11c51086ef7359289`	deobfuscated-js	multi-marker percent-array combined decoded JavaScript at offset 0x101C	1555 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 3 eval/decoder/string-building token(s).

Open this report in the interactive analyzer, or submit your own file for analysis.