PDF malware analysis — malicious · 4a74b9b3c0c4cb25

MALICIOUS

PDF

8.2 KB

MD5: bc754507fc4b3a985a39e9732b933765 SHA-1: fc87feb81ff52e08e9db00ef305dde584049c61c SHA-256: 4a74b9b3c0c4cb2598c76c8ed7b1af0de4b2277a21cdde7aa6b773b6abab50ee

126 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.001 Malicious Link

The PDF file contains embedded JavaScript, including calls to eval() and String.fromCharCode(), indicating obfuscated code execution. The critical CVE-2007-5659 heuristic firing points to the use of Collab.collectEmailInfo to exploit a vulnerability, likely for arbitrary code execution. The embedded JavaScript streams, particularly legacy_pdfkit_stage_001.js, are deobfuscated and suggest the script's purpose is to download and execute a second-stage payload from a remote source, although the specific URL is not directly extractable from the provided evidence.

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` `562a0dbdbe672988dd5655927d4bc243163182d6ef2112814ec13dbb0c8f5bc9`	pdf-javascript-stream	PDF /JS object 4 at offset 0xE1	311 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` `a5dc07a7af710e98d66865d614b81a1d9acb2e798de980de1d4a435943fd8b34`	deobfuscated-js	repeated-marker hex decoded JavaScript at offset 0x1B28	1828 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` `df0bd4434f29619bae2cfef9221c44a1f0bb3f5b53dbb5b05f5edd2738b870c9`	deobfuscated-js	annotation-subject callee-key decoded JavaScript at offset 0x35D	5103 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 5 eval/decoder/string-building token(s).

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