PDF malware analysis — malicious · d9c812a2910f6c15

MALICIOUS

PDF

12.0 KB

MD5: 212fb5a77155929ea1bc5dc57b0cab7a SHA-1: f5bc25c9082b55730337a655dbc5582d28021cf2 SHA-256: d9c812a2910f6c15dc59b42a8696da2fede4cbfdd8f98af760956cc683646e46

146 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.001 Malicious Link

The file is a PDF containing embedded JavaScript that leverages the CVE-2007-5659 vulnerability. The JavaScript uses String.fromCharCode and is heavily obfuscated, but the critical heuristic indicates it exploits the Collab.collectEmailInfo method. This technique is commonly used to download and execute additional malicious content. The presence of multiple deobfuscated JavaScript files suggests a multi-stage attack.

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` `4b3fcdf9628da95bdc85c3cb082af7f5373c2bfbfb9a1bee636400c4d57a9357`	deobfuscated-js	repeated-marker hex decoded JavaScript at offset 0x36F	12346 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 long base64-like blob(s).
`legacy_pdfkit_stage_001.js` `4376d2376e2aa00a7a4c5e63df723cf80e1dfa473a59f7876fa6aec5e2ce9ca1`	deobfuscated-js	repeated-marker hex decoded JavaScript at offset 0x36F	5106 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 5 eval/decoder/string-building token(s).

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