PDF malware analysis — malicious · 23b89497e55f6498

MALICIOUS

PDF

11.9 KB

MD5: 11aae9da6e0cf4b4f8650181d1096ff9 SHA-1: 5e62385eb66c4b06e3a600959b36c5eb1e42d179 SHA-256: 23b89497e55f649866fb6311042209dc65204a25a59683fc7dedb765f2e75720

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, indicated by multiple heuristic firings including 'PDF_JAVASCRIPT' and 'PDF_JS'. A critical heuristic, 'CVE_2007_5659', specifically identifies the use of 'Collab.collectEmailInfo' to execute JavaScript by concatenating info fields and extracting characters at a fixed stride. This technique is commonly used to download and execute further malicious content. ClamAV also detected the file as 'Pdf.Exploit.Agent-36065', confirming its malicious nature. The presence of deobfuscated JavaScript files ('legacy_pdfkit_stage_000.js', 'legacy_pdfkit_stage_001.js') suggests a multi-stage infection process.

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` `dd7e3ecbb3d129846f25f7a2368abc82ad5a9a779f405a77600d8e41ef3e9978`	deobfuscated-js	repeated-marker hex decoded JavaScript at offset 0x315	12271 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 long base64-like blob(s).
`legacy_pdfkit_stage_001.js` `1e38c410f36ab58431dd5f68f8af660a7457d2fae5e2773a909844df40c6e943`	deobfuscated-js	repeated-marker hex decoded JavaScript at offset 0x315	5038 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 5 eval/decoder/string-building token(s).

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