PDF malware analysis — malicious · 8b129c98eec19c88

MALICIOUS

PDF

11.8 KB

MD5: c3f849ad5a13b03b9c1f818e9db2ad33 SHA-1: dc51a0aff59197e7b6ec843d5c3228672025cb6b SHA-256: 8b129c98eec19c8888802841f09196d8bda564bb2cc3af3f5624515ce1eb31c8

138 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.001 Malicious Link T1204.002 Malicious File

The PDF file contains embedded JavaScript, identified by the PDF_JAVASCRIPT and PDF_JS heuristics. The critical CVE_2007_5659 heuristic indicates the use of the Collab.collectEmailInfo JavaScript function, a known method for exploiting vulnerabilities in older PDF readers. This function is used to construct and execute JavaScript, likely to download and run a second-stage payload. The presence of deobfuscated JavaScript files further supports this. The file is classified as malicious by ClamAV with the signature Pdf.Exploit.Agent-36065.

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)
ClamAV: Pdf.Exploit.Agent-36065 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Exploit.Agent-36065
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` `9c67560e8c63b720885d3efc1627b844b86a6ec08e99e5b65a22eae832045756`	pdf-javascript-stream	PDF /JS object 7 at offset 0x19C	431 bytes
`legacy_pdfkit_stage_000.js` `03f9a1689a35b159647f1ef6570c78c5e75c2bd5e1cff563f113e0bb6b2ee596`	deobfuscated-js	repeated-marker hex decoded JavaScript at offset 0x315	12066 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 long base64-like blob(s).
`legacy_pdfkit_stage_001.js` `d84beb4bfb522484cb87beaa43c138060d72b89f4832d4ca93cd1288389e86d0`	deobfuscated-js	repeated-marker hex decoded JavaScript at offset 0x315	5001 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 5 eval/decoder/string-building token(s).

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