PDF malware analysis — malicious · 26cbbedb2d0066c8

MALICIOUS

PDF

11.8 KB

MD5: e3de7be4122cfca0fb2ffa67ce22a182 SHA-1: 1c0fef5c61b63baa1b21d4183d0d356f2f680981 SHA-256: 26cbbedb2d0066c85f9ea3e8a0455bd1a794bfcdc1813a6725e56be1403fdffb

146 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 JavaScript T1204.002 Malicious File

The file is a PDF containing embedded JavaScript, which is being used to exploit the CVE-2007-5659 vulnerability via the Collab.collectEmailInfo method. This technique is commonly used to download and execute further malicious content. The ClamAV detection of 'Pdf.Exploit.Agent-36079' further supports the malicious nature of the file.

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` `3f59086f7f242bd665cd64d076e01891c544b1cd236b8301fc5775d135b544e8`	deobfuscated-js	repeated-marker hex decoded JavaScript at offset 0x36F	12392 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 long base64-like blob(s).
`legacy_pdfkit_stage_001.js` `56b8f892d475edad919e426247dfadeea9720bcf6f6938a7ebc2b9a0eb9edc2e`	deobfuscated-js	repeated-marker hex decoded JavaScript at offset 0x36F	5112 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 5 eval/decoder/string-building token(s).

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