PDF malware analysis — malicious · 45d26e0f2c8393b8

MALICIOUS

PDF

8.2 KB

MD5: 1a4a4fb3101281ccce3057d4f971e9ce SHA-1: 4a8c48b7481bdda8ca85b7852a1b7a016934a64a SHA-256: 45d26e0f2c8393b872b8230840e6090e36b6af66c4c6d6132335cb7e90d9c360

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 via the Collab.collectEmailInfo method. The JavaScript is obfuscated and uses eval() and String.fromCharCode(), indicating it's designed to download and execute a secondary payload. The presence of multiple deobfuscated JavaScript files suggests a multi-stage attack. No specific family could be identified.

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` `dbbb96c440d7176e1e1f9024fd314942413be0d5e5112dd4aa64d42ff2a6e8fc`	pdf-javascript-stream	PDF /JS object 4 at offset 0xE1	297 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` `bafbe028f570f827b8889df90610c86efda3ac2b7154b34f0cb5caa79ff10457`	deobfuscated-js	repeated-marker hex decoded JavaScript at offset 0x1B07	1938 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` `ea9c577fcb9d70a2dcfc6791f36792967d27abb1a4464b3baa547e949f9aa512`	deobfuscated-js	annotation-subject callee-key decoded JavaScript at offset 0x354	5092 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 5 eval/decoder/string-building token(s).

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