PDF malware analysis — malicious · 84ee040563d32884

MALICIOUS

PDF

8.1 KB

MD5: d58ff39c41fd24556ed9c35da7306af5 SHA-1: 33d71626d03dd0c04a42d23a18fadb9910f30f15 SHA-256: 84ee040563d328848c321de30aeb435f4aae372f81c18e7c0bdb740fbc7cc577

156 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.002 Malicious File

The PDF sample contains embedded JavaScript, flagged by multiple heuristics including a critical CVE-2007-5659 detection related to Collab.collectEmailInfo. The JavaScript is obfuscated and uses eval() and String.fromCharCode(), indicating it's designed to download and execute a second-stage payload. The ML classifier strongly supports a malicious verdict.

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` `3787036ca269837a944e0f6e0748cd490b1e6a723de31fc31c25949b6ecc8244`	pdf-javascript-stream	PDF /JS object 4 at offset 0xE1	302 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` `dabdfbd3fced0e8b90508528e95a83c5abac327f72ec4ec912c06c04ec2a85f2`	deobfuscated-js	repeated-marker hex decoded JavaScript at offset 0x1ACF	1843 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` `370a82c586c6e34e7a69657dccf2304a5e8b2545cf5a4c54e51a77701edcde88`	deobfuscated-js	annotation-subject callee-key decoded JavaScript at offset 0x357	5048 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 5 eval/decoder/string-building token(s).

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