PDF malware analysis — malicious · 8b6edb718621453e

MALICIOUS

PDF

11.6 KB

MD5: 8c8bd1014ecdaea7ae02844f1d15cff6 SHA-1: fb8d30b8891cd096fd2efc99ec132437bcf0200e SHA-256: 8b6edb718621453ec676d80dc1badd21efe62ce0a112f5f3caa39f212e055257

146 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 JavaScript T1204.001 Malicious Link T1204.002 Malicious File

The critical heuristic CVE_2007_5659 indicates the exploitation of a vulnerability in PDF documents, specifically related to the `Collab.collectEmailInfo` JavaScript function. This is further supported by other PDF-specific heuristics indicating embedded JavaScript and the use of `String.fromCharCode` for obfuscation. The file is identified as malicious by ClamAV. The primary attack vector appears to be the exploitation of CVE-2007-5659 to execute JavaScript, which is likely used to download and execute a secondary payload.

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` `1f7e6cce171c5f3e47c311d96dab9ee5ff23c3a14f2fac9c4ef0bf51dcfaae3a`	deobfuscated-js	repeated-marker hex decoded JavaScript at offset 0x36F	12074 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 long base64-like blob(s).
`legacy_pdfkit_stage_001.js` `2a7ed6b2c4ac294fab21aacb6e787621db308025fa996e2849285f13882b604f`	deobfuscated-js	repeated-marker hex decoded JavaScript at offset 0x36F	4922 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 5 eval/decoder/string-building token(s).

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