PDF malware analysis — malicious · cdf3514907a7ecaa

MALICIOUS

PDF

11.8 KB

MD5: 0490a60f609b64cdbec781bd16d34a27 SHA-1: 7bbbe8a2a5be3972024851875cdb7446a3ef326a SHA-256: cdf3514907a7ecaac351617ff052d395f07aabab617d79757b970f5a94c4cbc7

138 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.001 Malicious Link

The PDF file contains embedded JavaScript that exploits CVE-2007-5659 via the `collab.collectEmailInfo` function. This JavaScript is further obfuscated and split into multiple files, indicating an attempt to evade detection. The primary function of the script appears to be downloading and executing a second-stage payload, as suggested by the heuristic firings and the presence of deobfuscated JavaScript streams. The extracted filenames 'legacy_pdfkit_stage_000.js' and 'legacy_pdfkit_stage_001.js' further support this. The lack of readable document body text means the exact lure cannot be determined, but the exploit mechanism is clear.

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` `7d783f0a2c07fb960f98fcfffec897fe9585f342cdd06197ef78eb84bf8ef15e`	deobfuscated-js	repeated-marker hex decoded JavaScript at offset 0x315	11963 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 long base64-like blob(s).
`legacy_pdfkit_stage_001.js` `240fee865f9b62fdd186ae4869a734dec870e47b0f44789a29aff41304e71236`	deobfuscated-js	repeated-marker hex decoded JavaScript at offset 0x315	4931 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 5 eval/decoder/string-building token(s).

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