PDF malware analysis — malicious · c668bfbd4d8a9cff

MALICIOUS

PDF

9.5 KB

MD5: 2d3cce2c0043aca589910bff85a1c54c SHA-1: 2fdcf7222c06aaf5ef1c24c1d0262834ce287964 SHA-256: c668bfbd4d8a9cffa88a683f2a4815ab6b8d404d3db443f1a432f854a6e19571

180 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 JavaScript/JScript T1204.002 Malicious Link/URL T1566.002 Spearphishing Attachment

The file is a PDF containing embedded JavaScript, which is a common delivery mechanism for exploits. The critical heuristic 'CVE_2007_5659' specifically indicates the use of a known vulnerability (Collab.collectEmailInfo) to execute JavaScript. The JavaScript is heavily obfuscated, but the presence of 'unescape()' and the 'ClamAV: Pdf.Exploit.Agent-35905' detection strongly suggest it's designed to download and execute a second-stage payload. 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)
ClamAV: Pdf.Exploit.Agent-35905 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Exploit.Agent-35905
unescape() call high PDF_UNESCAPE

unescape() found — often used to decode shellcode in PDF JS exploits (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.
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_obj0007_000.js` `d8a6b4ad1abf04d0c4a4f89535cfb57f7312edef25c443f4e844c8ec9d0929dd`	pdf-javascript-stream	PDF /JS object 7 at offset 0x19B	352 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` `2455f060a13c5ba02c86c5882e2de235753f135532a74a32e05873657663735d`	deobfuscated-js	repeated-marker hex decoded JavaScript at offset 0x2FE	12177 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).
`legacy_pdfkit_stage_001.js` `d38279b80660b339b37c18e510cd8cc7d0a90de61b4ca01e0be45d52e19053c3`	deobfuscated-js	repeated-marker hex decoded JavaScript at offset 0x2FE	5106 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 5 eval/decoder/string-building token(s).

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