PDF malware analysis — malicious · 51ced362e5852de2

MALICIOUS

PDF

9.4 KB

MD5: fcf360697c267e82827d16a85ccab7d7 SHA-1: 0a9bbb561245d9a538025991a8435ed1e23404a0 SHA-256: 51ced362e5852de28b07716df97feec77589764065178d7a222ee734dc3e82b0

126 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.001 Malicious Link

The PDF file contains embedded JavaScript that leverages the CVE-2007-5659 vulnerability (Collab.collectEmailInfo). This exploit is designed to download and execute a second-stage payload. The presence of eval() and String.fromCharCode() calls in the JavaScript further indicates obfuscation and dynamic code execution, typical of malware delivery.

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_obj0005_000.js` `516e054c7a9b3cb03dd01dadda2cb800c739e9942111bf5cbe647dd0f9cf75f9`	pdf-javascript-stream	PDF /JS object 5 at offset 0x107	300 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` `52111e811a2de06031e18419df6d60a69f31b4c21b1bf1d80504988fa1a497fc`	deobfuscated-js	z-percent hex-pair decoded JavaScript at offset 0x30D	5003 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 5 eval/decoder/string-building token(s).
`legacy_pdfkit_stage_001.js` `da66989a4a6c36693d405e65d2cfb53bd32d0cf002edd1d49c5b7c6dc6c3db16`	deobfuscated-js	repeated-marker hex decoded JavaScript at offset 0x30D	11727 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s). Carved artifact contains 1 long base64-like blob(s).

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