PDF malware analysis — malicious · 49fb3d5c3748ebd2

MALICIOUS

PDF

11.7 KB

MD5: aaabd20538ce1326fe1978c03e08d7f8 SHA-1: 1d3ba8a14c5732e69780c8abd631173b99489c8e SHA-256: 49fb3d5c3748ebd2ad78d3b84827c9d6a44c7b09dbf9189572dd1f1c6ef2dd8d

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 a common delivery mechanism for exploits. The critical heuristic CVE_2007_5659 indicates the use of a known vulnerability (Collab.collectEmailInfo) to execute JavaScript. This script is likely designed to download and execute a second-stage payload, as suggested by the ClamAV detection and the presence of multiple deobfuscated JavaScript files. The exact payload and its ultimate destination could not be determined due to the obfuscation and the nature of the exploit.

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` `44746845089f9eb4dabde94c21636e9989e4a0ce2824d00b8a7a8e50a11f8e8f`	deobfuscated-js	repeated-marker hex decoded JavaScript at offset 0x36F	12048 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 long base64-like blob(s).
`legacy_pdfkit_stage_001.js` `8bdc849725d84cdb9f4ce2a62767f1d115c80c136fee8d420534fa1d9117cbcf`	deobfuscated-js	repeated-marker hex decoded JavaScript at offset 0x36F	4954 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 5 eval/decoder/string-building token(s).

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