PDF malware analysis — malicious · f85e632988f02252

MALICIOUS

PDF

12.1 KB

MD5: 3b37144c1b4ed6e2b822aaf76d4e9e73 SHA-1: 97015594e7b21d96053edec78f9bde9ae8c0110c SHA-256: f85e632988f02252da5d1f7f95cdbd53f02f7c921f7eebae88817ad1126b1a05

146 Risk Score

Malware Insights

MITRE ATT&CK

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

The file is a PDF containing embedded JavaScript, which is a common delivery mechanism for exploits. The critical heuristic firing for CVE-2007-5659 indicates a known vulnerability is being targeted. The embedded JavaScript, particularly the deobfuscated streams, likely contains code to download and execute additional malicious content, although the exact payload could not be determined from the static analysis alone. The ClamAV detection further confirms 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` `a49fcc283ede7e3649f700a6c47a6545f3653ab1836058bf6c86ff414d9614f3`	deobfuscated-js	repeated-marker hex decoded JavaScript at offset 0x36F	12694 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 long base64-like blob(s).
`legacy_pdfkit_stage_001.js` `1923424c63ec1e281fe8fda0fe617c3f28f81249bb01359fada5c3c0a7addd4c`	deobfuscated-js	repeated-marker hex decoded JavaScript at offset 0x36F	5165 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 5 eval/decoder/string-building token(s).

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