PDF malware analysis — malicious · ca39a277765f794e

MALICIOUS

PDF

11.9 KB

MD5: 52301cd4ab14b9d75c1f33bc3fe6effd SHA-1: 7dcb6cffb6f80460d6eb2d9de29f641db11a7b32 SHA-256: ca39a277765f794e5961e5a88cdd1bc007da386ccca97b9dd81f99fc7767ab35

146 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.001 Malicious Link

The PDF file contains embedded JavaScript that leverages the CVE-2007-5659 vulnerability, specifically using the Collab.collectEmailInfo method. This exploit is designed to execute arbitrary JavaScript, which is then used to download and execute a second-stage payload. The presence of multiple obfuscated JavaScript streams and ClamAV detection further supports its malicious nature. The exact payload and delivery mechanism are not fully discernible due to obfuscation, hence the 'unknown family' classification.

Heuristics 6

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-36079 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Exploit.Agent-36079
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.
String.fromCharCode low PDF_FROMCHARCODE

String.fromCharCode found — used to construct payload strings dynamically. Common in benign JavaScript libraries for codepoint manipulation, so this alone is informational; weaponised use is also caught by the dedicated fromCharCode-stage and exploit-shape rules. (matched inside decoded stream)
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` `ef8bdac794684ae9cd4eb7091d80e1c5ca478c06c639d72d01626c1f7ce78b6d`	pdf-javascript-stream	PDF /JS object 7 at offset 0x19C	578 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s).
`legacy_pdfkit_stage_000.js` `fc2e67e6c1c272d5968de4deef9f4a0dc48393bacc5e5a7fc21051df3eae0dc3`	deobfuscated-js	repeated-marker hex decoded JavaScript at offset 0x36F	12348 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 long base64-like blob(s).
`legacy_pdfkit_stage_001.js` `1b4d228f14c39d04f95aa061b5fba4f2dc6331a132021c62f762fd45f2845f36`	deobfuscated-js	repeated-marker hex decoded JavaScript at offset 0x36F	5080 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 5 eval/decoder/string-building token(s).

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