PDF malware analysis — malicious · 4af79cd8a128721a

MALICIOUS

PDF

12.9 KB

MD5: a817d2c91d9c048f15d21dbb1a5bcc2f SHA-1: e3f84e6671a6b0dddd2ef30ba0a2c2e62aee1ef1 SHA-256: 4af79cd8a128721a3e80ae589c57faac3cdf5f0232c7bd7dd9581a044bb76859

138 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.002 Malicious File

The PDF file contains embedded JavaScript, identified by the PDF_JAVASCRIPT and PDF_JS heuristics. The critical CVE_2007_5659 heuristic indicates the exploitation of a known PDF vulnerability using JavaScript. The extracted JavaScript files (legacy_pdfkit_stage_000.js and legacy_pdfkit_stage_001.js) are likely responsible for downloading and executing a second-stage payload, as suggested by the ClamAV detection of Pdf.Exploit.Agent-36062. The exact behavior of the scripts is not fully discernible due to potential obfuscation, but the overall pattern points to a malicious PDF dropper.

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-36062 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Exploit.Agent-36062
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` `068944f8c011a88ab770b45c6de142b9305a1f515d410204d5eadd9ac2b5bfb3`	pdf-javascript-stream	PDF /JS object 7 at offset 0x19B	373 bytes
`legacy_pdfkit_stage_000.js` `9ab9ed2d9dde2db020ce63a39ace95053cc16ad5d816079e452decc658a90d6f`	deobfuscated-js	repeated-marker hex decoded JavaScript at offset 0x2F5	12558 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 long base64-like blob(s).
`legacy_pdfkit_stage_001.js` `6320ce4e2d6f2258945776f0c2c2ca5af8a1c302b303ffbb60ff23b302a75bda`	deobfuscated-js	repeated-marker hex decoded JavaScript at offset 0x2F5	5207 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 5 eval/decoder/string-building token(s).

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