PDF malware analysis — malicious · f6cf3d6a83abe460

MALICIOUS

PDF

11.5 KB

MD5: 016a68b2fb7a18b5be5d315d0d778f59 SHA-1: 56cb087c9f29d3a443f23d5dcbe844389f36ec1a SHA-256: f6cf3d6a83abe4602f6d51b8b7daec5adc92512470a73798de5c6ead05e775d7

146 Risk Score

Malware Insights

MITRE ATT&CK

T1204.002 Malicious File T1059.001 PowerShell

The file is a PDF containing embedded JavaScript that exploits CVE-2007-5659, a known vulnerability in Adobe Reader. The critical heuristic firings and ClamAV detection strongly indicate malicious intent. The embedded JavaScript, particularly the use of String.fromCharCode and the Collab.collectEmailInfo method, is designed to decode and execute further malicious code, likely a second-stage payload. No specific family could be identified, but the exploit vector is clear.

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` `73a19228080a58616adab64da4d2bd1e6887afc2f3b132720bd8d341cce9b2f8`	deobfuscated-js	repeated-marker hex decoded JavaScript at offset 0x36F	12178 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 long base64-like blob(s).
`legacy_pdfkit_stage_001.js` `4a462c552075016718c0950a438da44d897e6c830ecaff40c885f62472a4fb2d`	deobfuscated-js	repeated-marker hex decoded JavaScript at offset 0x36F	4991 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 5 eval/decoder/string-building token(s).

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