PDF malware analysis — malicious · 88c8a533691e0171

MALICIOUS

PDF

12.1 KB

MD5: 3760077b7a6ccab86c51dfbf3702582a SHA-1: d460fe47a016867959d130758bc33a2cc14a39c7 SHA-256: 88c8a533691e01715a7e5eb7473f2bb0ea010c029ef0ef319c8e0e16f48d17a0

138 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.002 Malicious File

The PDF file contains embedded JavaScript, as indicated by multiple heuristic firings. Specifically, the CVE-2007-5659 heuristic points to the use of 'Collab.collectEmailInfo' to execute JavaScript. This JavaScript is further deobfuscated into two files, 'legacy_pdfkit_stage_000.js' and 'legacy_pdfkit_stage_001.js'. The ClamAV detection 'Pdf.Exploit.Agent-36065' confirms the malicious nature of the file, suggesting it's part of an exploit kit designed to deliver a second-stage payload.

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` `1cdf500c495e126ed0b2da6d655459ac6ed87bd4aae4c998c010f6b9e6c882d6`	deobfuscated-js	repeated-marker hex decoded JavaScript at offset 0x315	12414 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 long base64-like blob(s).
`legacy_pdfkit_stage_001.js` `dff9f170caf5410e370ba7510b2823a216d8f23c338792048dac47a43e4b3ac6`	deobfuscated-js	repeated-marker hex decoded JavaScript at offset 0x315	5092 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 5 eval/decoder/string-building token(s).

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