PDF malware analysis — malicious · 7e47f9ec3f9ef659

MALICIOUS

PDF

8.0 KB

MD5: 21bbe129d0d12d55ff2033bf4952de49 SHA-1: 84785a00b974617e01fc1a84ac18543f1098a0f5 SHA-256: 7e47f9ec3f9ef65967f2c72218a8e2989eff7363457f312c56c3213c996e4dc7

158 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.001 Malicious Link T1071.001 Web Protocols

The PDF sample contains embedded JavaScript that leverages the CVE-2007-5659 vulnerability (Collab.collectEmailInfo). The JavaScript is obfuscated but appears to be designed to download and execute a second-stage payload from a remote source. The ML classifier strongly indicates maliciousness, and the presence of JavaScript actions and eval calls further supports this. No specific family could be identified.

Machine Learning

Nyx PDF Classifier malicious score 1.0000

Heuristics 6

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 (matched inside decoded stream)
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.
String.fromCharCode low PDF_FROMCHARCODE

String.fromCharCode found — used to construct payload strings dynamically. Common in benign JavaScript libraries for codepoint manipulation, so this alone is informational; weaponised use is also caught by the dedicated fromCharCode-stage and exploit-shape rules. (matched inside decoded stream)
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 3

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj0004_000.js` `b18c3ae03df1cdada1f03c6f4ecb11ad62cee2e6da87fb793cf65604cf3dc53d`	pdf-javascript-stream	PDF /JS object 4 at offset 0xE1	307 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s).
`legacy_pdfkit_stage_000.js` `8e95a6b824be5f74faa58cd1e04dce266ee8fef91fbbd6f35dfabf364193c87b`	deobfuscated-js	repeated-marker hex decoded JavaScript at offset 0x1AC8	1628 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s).
`legacy_pdfkit_stage_001.js` `1a199ba725a7cb9cda2b3119d9df475d9b9382b22db05c0cb633dcc86b3c0224`	deobfuscated-js	annotation-subject callee-key decoded JavaScript at offset 0x359	5053 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 5 eval/decoder/string-building token(s).

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