PDF malware analysis — malicious · b3d6ef20d4902664

MALICIOUS

PDF

8.1 KB

MD5: cbede6ca0d8059f6037da30cd5f59c2f SHA-1: e1c203fe10d71b88420a2ae952d86f367ad496b1 SHA-256: b3d6ef20d49026646a105b47dc5569758a817023aa3a88bc6798291e7239ff4b

156 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.001 Malicious Link T1204.002 Malicious File

The PDF file contains embedded JavaScript that utilizes the `Collab.collectEmailInfo` function, a known indicator for the CVE-2007-5659 vulnerability. The JavaScript is obfuscated and uses `eval()` and `String.fromCharCode()`, suggesting it's designed to download and execute a secondary payload. The ML classifier strongly indicates maliciousness.

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` `b87c530062d00300c0ef58a87597149878704be8a9cbf04a610e2ab987143965`	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` `2f6d35fd1b514b6f95b551bf7ae22d75311d9772d46df83415842b0fdd275a74`	deobfuscated-js	repeated-marker hex decoded JavaScript at offset 0x1B26	1680 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` `33100118a1c13c285fae9569a88afebd0652d83542bd5b429edd0ad8b1cb73cc`	deobfuscated-js	annotation-subject callee-key decoded JavaScript at offset 0x357	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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