PDF malware analysis — malicious · c44ea47588f71305

MALICIOUS

PDF

13.0 KB

MD5: 704eba16b68be23f977f6bb08a539c51 SHA-1: 65248045076dd9e0d38649a9089da090d8aecd3b SHA-256: c44ea47588f71305f0165f50f52b227a72b3543b2b4076b7a7af6ec5d2d3d777

216 Risk Score

Malware Insights

MITRE ATT&CK

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

This PDF file contains embedded JavaScript that utilizes a binary-XOR stager, a technique commonly used to obfuscate malicious code. The critical heuristic 'CVE_2007_5659' indicates the exploitation of a known vulnerability in Adobe Reader via the 'Collab.collectEmailInfo' method. The primary intent appears to be the execution of a second-stage payload, as suggested by the stager's nature and the ClamAV detection as a dropper. No specific family could be identified, but the attack pattern is consistent with PDF-based exploit delivery.

Machine Learning

Nyx PDF Classifier malicious score 1.0000

Heuristics 7

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.Dropper.Agent-7300545-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Dropper.Agent-7300545-0
Binary-XOR JavaScript stager high PDF_BINARY_XOR_JS_STAGER

PDF JavaScript stores viewer-version payload branches as long binary digit strings, XORs each bit pair, converts 8-bit chunks with String.fromCharCode, and evals the recovered exploit stage.
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 2

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj0049_000.js` `b6d4cfca36fc941259f68eaa8436e3cea15ab5ac30f8e3e72b441ecd747205c1`	pdf-javascript-stream	PDF /JS object 49 at offset 0xA	77116 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s). Carved artifact contains 6 long base64-like blob(s).
`binary_xor_stage_000.js` `16c05682a41ee00231b49b0cdcf9b74b36c09e49dcd8049eab28f2ef78598e84`	deobfuscated-js	binary-XOR decoded JavaScript at offset 0x3F8	1282 bytes

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