PDF malware analysis — malicious · 49852c55bbdc07c8

MALICIOUS

PDF

11.7 KB

MD5: 6668ed7db362a47e351dd1e5aef80b88 SHA-1: cab3dba0f4a65bae65e6c7afe60b2f0f5b7da4a7 SHA-256: 49852c55bbdc07c83fc2f3645a4726469a45685e0ce17f278597d1923f35a65d

146 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.002 Malicious Link

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, although the specific payload and its destination could not be determined from the provided evidence. The PDF structure and the presence of obfuscated JavaScript streams further support this assessment.

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` `22e398f9e73078afabdcac8ed12f94a1b7e26b684839a07fb48b634dbf414fba`	deobfuscated-js	repeated-marker hex decoded JavaScript at offset 0x36F	12239 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 long base64-like blob(s).
`legacy_pdfkit_stage_001.js` `16f8a505c9792af10d95fed9be374eabe718860023b8fb20176ae05692b598a7`	deobfuscated-js	repeated-marker hex decoded JavaScript at offset 0x36F	5061 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 5 eval/decoder/string-building token(s).

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