PDF malware analysis — malicious · 4e8254a0971c7e83

MALICIOUS

PDF

11.5 KB

MD5: 397709c928920d23e49691716f28a63b SHA-1: 8f6cbf232a02a6c1ca34b177b11ecae7c693860a SHA-256: 4e8254a0971c7e8366c93309976d50c10a8f7a72b42eb831c7e29c01debad6b9

146 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.002 Malicious File

The file is a PDF containing embedded JavaScript, which is known to be used for exploiting vulnerabilities. Specifically, the 'CVE_2007_5659' heuristic indicates the use of the Collab.collectEmailInfo method, a known exploit vector. The embedded JavaScript is heavily obfuscated, but the presence of 'String.fromCharCode' and the overall structure suggest it's designed to download and execute a second-stage payload. The ClamAV detection further supports its malicious nature.

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` `9ceba8e7dd2213f44b352d6b626952d73b3f4ba6ef9cfcca7c1bc4216430ea28`	deobfuscated-js	repeated-marker hex decoded JavaScript at offset 0x36F	12192 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 long base64-like blob(s).
`legacy_pdfkit_stage_001.js` `1764e83e16ce31e3960bf397202fed51b42a2b3d78c0b5c3e22c58d238819ea8`	deobfuscated-js	repeated-marker hex decoded JavaScript at offset 0x36F	5013 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 5 eval/decoder/string-building token(s).

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