PDF malware analysis — malicious · 2ec5de103b9f4997

MALICIOUS

PDF

11.7 KB

MD5: 2728a9ad38bf1b9410f75c5eca1109e7 SHA-1: 7ddb96e40a65f49904972943bf1c87dff7c9de1a SHA-256: 2ec5de103b9f4997b557aa2335cc8cbfa3e78328e77158c9a99202b9aabb3fdc

146 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.001 Malicious Link or Macro

The PDF file contains embedded JavaScript that leverages the CVE-2007-5659 vulnerability. This exploit is designed to execute arbitrary code, as indicated by the 'Collab.collectEmailInfo' method and the detection of 'Pdf.Exploit.Agent-36079' by ClamAV. The JavaScript is heavily obfuscated, but the core functionality appears to be the exploitation of this known PDF vulnerability. The presence of multiple JavaScript streams and the critical heuristic firings strongly suggest malicious intent.

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` `512c4109c5c854af0e3dd42d30b299a61f34a0d2ccc5a46e4ad5718996b7f7f3`	deobfuscated-js	repeated-marker hex decoded JavaScript at offset 0x36F	12126 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 long base64-like blob(s).
`legacy_pdfkit_stage_001.js` `816347844cc549b5862e34a294be9e5ef3bce0b3e40fa16353762482ec45b49c`	deobfuscated-js	repeated-marker hex decoded JavaScript at offset 0x36F	5019 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 5 eval/decoder/string-building token(s).

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