PDF malware analysis — malicious · bdb7522e974ca5ba

MALICIOUS

PDF

11.8 KB

MD5: a84724de8706995f59270a9de78e77d9 SHA-1: b79809b7b9c4182c86108277c4a4a320ebe204c2 SHA-256: bdb7522e974ca5ba872b5681883191c81705ea8c311bf52cde4d564d8ed78d4c

138 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.001 Malicious Link

The PDF file contains embedded JavaScript, identified by multiple heuristics including PDF_JAVASCRIPT and PDF_JS. The critical CVE-2007-5659 heuristic indicates the exploitation of a known vulnerability within Adobe Reader, specifically targeting the Collab.collectEmailInfo function to execute JavaScript. This JavaScript is further obfuscated and split into multiple files (legacy_pdfkit_stage_000.js, legacy_pdfkit_stage_001.js), suggesting a multi-stage download and execution process. The primary intent appears to be the delivery of a second-stage payload, as indicated by the ClamAV detection of 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` `a23d630c091bb211230801ead7b6dd705300bb04e63e496512c11dc747e84750`	deobfuscated-js	repeated-marker hex decoded JavaScript at offset 0x315	12148 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 long base64-like blob(s).
`legacy_pdfkit_stage_001.js` `b84f81cd8588aa0013572bc964c093aa6fb47f783925c225ea8e1b8c2123c283`	deobfuscated-js	repeated-marker hex decoded JavaScript at offset 0x315	5025 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 5 eval/decoder/string-building token(s).

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