PDF malware analysis — malicious · efc1a20858de5a80

MALICIOUS

PDF

12.6 KB

MD5: dea0c985ed54b229b929076726fa056a SHA-1: 70cb59fc8e7dcd5c70dd6609cd372f97ce249fb4 SHA-256: efc1a20858de5a80cb0cd78bf15dbb3751929635a2ec198f79ba9d20185db97c

138 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.002 Malicious File

The PDF file contains embedded JavaScript that leverages the CVE-2007-5659 vulnerability (Collab.collectEmailInfo). This exploit is designed to execute arbitrary JavaScript, which in this case appears to be a multi-stage downloader. The presence of deobfuscated JavaScript files suggests an attempt to conceal malicious code execution, likely for downloading and executing further payloads.

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` `39275d2ea49060a948358afe1efd7d444a4117028c66b68895464f5b4d5ad473`	deobfuscated-js	repeated-marker hex decoded JavaScript at offset 0x2F5	12256 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 long base64-like blob(s).
`legacy_pdfkit_stage_001.js` `e2d2774a00d726043f284f6d858da4ec56942df23cd5e86ba82bed5b756506c2`	deobfuscated-js	repeated-marker hex decoded JavaScript at offset 0x2F5	5097 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 5 eval/decoder/string-building token(s).

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