PDF malware analysis — malicious · 900616f13b0551c9

MALICIOUS

PDF

11.9 KB

MD5: abf783a1100c9a6212845cd42e48cf85 SHA-1: 8133ad7091ab8e1b73eba6bf0b011e22f270b5d2 SHA-256: 900616f13b0551c98002d4452fe6f2cfb326ee91811533bbd80ec32dbe8eaafa

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. Critical heuristics indicate exploitation of CVE-2007-5659 using a method that decodes and evaluates JavaScript. The deobfuscated JavaScript files, legacy_pdfkit_stage_000.js and legacy_pdfkit_stage_001.js, are suspicious artifacts. The primary function of the embedded script appears to be the execution of further malicious code, likely a downloader for a second-stage payload, which is a common technique for exploiting PDF vulnerabilities.

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` `4f1d134b5eb9b53f8a9ff4e9ceea9e30a591aef3da16b28faeadfb1c1b9b625e`	deobfuscated-js	repeated-marker hex decoded JavaScript at offset 0x315	12276 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 long base64-like blob(s).
`legacy_pdfkit_stage_001.js` `000e9a9608e027cc0241b161718735846e4e1fbfc6b7b9b1550b3cc5783fd81c`	deobfuscated-js	repeated-marker hex decoded JavaScript at offset 0x315	5089 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 5 eval/decoder/string-building token(s).

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