PDF malware analysis — malicious · c68d56bccae164b0

MALICIOUS

PDF

8.1 KB

MD5: a20f34d57eda0cb276b65b6922226541 SHA-1: fd5a93e6ab60457fb48c2a314b41d3a9dca7c945 SHA-256: c68d56bccae164b08c5189fbbbccdc1587fa63c9248b304dc4b7e9db09f4c788

156 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.001 Malicious Link or Hypertext System

The PDF file contains embedded JavaScript, which is executed via a PDF reader vulnerability (CVE-2007-5659). The JavaScript is obfuscated and likely responsible for downloading and executing a second-stage payload. The ML classifier strongly indicates malicious intent. The presence of multiple deobfuscated JavaScript files suggests a complex execution chain.

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` `404a49ddf1e1ed758ad778fe601be335bd827c9668cb5a9b7143749d3c151083`	pdf-javascript-stream	PDF /JS object 4 at offset 0xE1	309 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` `1f8be54096002f05cc653f03aa4c3db27b522cdbccbc55b71f9a3eb430601bd5`	deobfuscated-js	repeated-marker hex decoded JavaScript at offset 0x1B4B	1652 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` `318ff629d97a40acf53330cc79d8d83b0f42f147a6b4cfa0fa370c1dc13b2b8f`	deobfuscated-js	annotation-subject callee-key decoded JavaScript at offset 0x35B	5112 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 5 eval/decoder/string-building token(s).

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