PDF malware analysis — malicious · 55490f3da33a4a5b

MALICIOUS

PDF

11.9 KB

MD5: 37dcc55765b74cb648087399b9e9cf0a SHA-1: 8c04014f01139769600a4f5141098a3eb8306280 SHA-256: 55490f3da33a4a5bfbaf9f64f9d73a6be20605afd9ab45f4640069386049c772

138 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.002 Malicious File

The PDF file contains embedded JavaScript, identified by multiple heuristics including CVE-2007-5659, indicating an exploit attempt. The embedded JavaScript streams, particularly 'legacy_pdfkit_stage_000.js' and 'legacy_pdfkit_stage_001.js', are likely responsible for executing the malicious payload. The ClamAV detection further confirms its malicious nature. The specific exploit used, CVE-2007-5659, targets the `Collab.collectEmailInfo` JavaScript function within PDFs.

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` `12584aedd8d51adc2f19e4d90f734f50029394146361e13b706fbd34f88abbcd`	deobfuscated-js	repeated-marker hex decoded JavaScript at offset 0x315	12111 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 long base64-like blob(s).
`legacy_pdfkit_stage_001.js` `cd02f5b03284a4fd8e522a52e9a9d1eb6720cfce6e02775eafc504562fd792cb`	deobfuscated-js	repeated-marker hex decoded JavaScript at offset 0x315	5014 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 5 eval/decoder/string-building token(s).

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