PDF malware analysis — malicious · 3ec7241f82e98294

MALICIOUS

PDF

9.9 KB

MD5: a8d4e4b7d4ddd528cede556b15644edb SHA-1: 9bd6cd0865c07eb7e65b2b703452f2a0112a5692 SHA-256: 3ec7241f82e9829480aaf40071b8d3aba320d8e85b714273c4c15f8468d47f2c

86 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.001 Malicious Link

The PDF file contains embedded JavaScript, triggered by the CVE-2007-5659 vulnerability (Collab.collectEmailInfo). Static analysis indicates this JavaScript is designed to download and execute a second-stage payload. The obfuscated nature of the script and the use of legacy exploit kit techniques suggest a downloader or dropper functionality. No specific family could be identified, but the exploit and delivery mechanism are clear.

Heuristics 5

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)
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` `5652654ff282cc49f8e37be075cabd73e28952821951f68818d46482b3192315`	pdf-javascript-stream	PDF /JS object 5 at offset 0x107	1131 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s).
`legacy_pdfkit_stage_000.js` `d4ed34a08ef07a6eb2c6c06e9809e1f222bfb40bad45a759ba810070221fc415`	deobfuscated-js	z-percent hex-pair decoded JavaScript at offset 0x3F6	5191 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` `186bee99a102f5c85cde153953f5a78d7405e6ae8c53304e57c28d984a2a608b`	deobfuscated-js	repeated-marker hex decoded JavaScript at offset 0x3F6	12408 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s). Carved artifact contains 1 long base64-like blob(s).

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