PDF malware analysis — malicious · a76120cefe699d8f

MALICIOUS

PDF

12.5 KB

MD5: e2bfdf9876aa04f27bec9c57033370b4 SHA-1: 700edc4ec371995963df9cfc15287f0f4c576c96 SHA-256: a76120cefe699d8fdf1919a5696e65b1d8f429cb86bf483429fc5718b9bf80a9

138 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 JavaScript/JScript T1204.002 Malicious File

This PDF file contains embedded JavaScript that leverages the CVE-2007-5659 vulnerability, specifically targeting the Collab.collectEmailInfo function. The critical heuristics indicate that the PDF launcher concatenates information fields, extracts characters at a fixed stride, and evaluates the result. This process is designed to execute a malicious script, likely a downloader for a second-stage payload, as evidenced by the deobfuscated JavaScript streams found within the sample.

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-36062 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Exploit.Agent-36062
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` `068944f8c011a88ab770b45c6de142b9305a1f515d410204d5eadd9ac2b5bfb3`	pdf-javascript-stream	PDF /JS object 7 at offset 0x19B	373 bytes
`legacy_pdfkit_stage_000.js` `35e65b33f9d3ca1c4bb0f2b801e7526a0587af8519002e41f703a0db7b920997`	deobfuscated-js	repeated-marker hex decoded JavaScript at offset 0x2F5	12231 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 long base64-like blob(s).
`legacy_pdfkit_stage_001.js` `5267378d636d4a6280385239e8ae4a83d54017a091b90ea7ee8052554c433ed3`	deobfuscated-js	repeated-marker hex decoded JavaScript at offset 0x2F5	5077 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 5 eval/decoder/string-building token(s).

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