PDF malware analysis — malicious · 4550546116d36f69

MALICIOUS

PDF

11.8 KB

MD5: a9ff60ecfd8845fe44075a16adb66cae SHA-1: d02631404233691ad38931b6d9a49bd3cb57d152 SHA-256: 4550546116d36f690cfdbfcef6bbe417ca58c58c37660817762502dd60b9f8a0

138 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, specifically using the 'collab.collectEmailInfo' method. This JavaScript is further deobfuscated into 'legacy_pdfkit_stage_000.js' and 'legacy_pdfkit_stage_001.js'. The primary function of this script appears to be downloading and executing a second-stage payload, indicated by the heuristic firings and the nature of the extracted JavaScript files. The document body is unreadable, but the exploit and script behavior are clear indicators of malicious intent.

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` `e77b54bddc91f9a2c77c339a08b3cac4c3b7fe1a60c2f131ee4eab31bd890a17`	deobfuscated-js	repeated-marker hex decoded JavaScript at offset 0x315	12241 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 long base64-like blob(s).
`legacy_pdfkit_stage_001.js` `2529b0eb44c95f33f7741e0e4e3b168029798a9fc6c6cc60b1f254ca4688a274`	deobfuscated-js	repeated-marker hex decoded JavaScript at offset 0x315	4994 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 5 eval/decoder/string-building token(s).

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