PDF / .COM malware analysis — malicious · 8b3c346ddfb248a2

MALICIOUS

PDF / .COM

40.9 KB

MD5: 5cfc211a853e7bb3595879121432ae63 SHA-1: 631b7f13f50108b9fd08bd1e9d547d932c62a076 SHA-256: 8b3c346ddfb248a24579660756a5a0752edf8229634892ab5e1072b93be7b88b

238 Risk Score

Malware Insights

MITRE ATT&CK

T1204.002 Malicious File T1059.001 PowerShell T1059.007 JavaScript

The PDF file contains embedded JavaScript and U3D content, triggering critical heuristics related to CVE-2007-5659 and a general PDF exploit indicator. The extracted JavaScript files, particularly 'legacy_pdfkit_stage_000.js', are indicative of a stager designed to download and execute a second-stage payload. The ClamAV detection further confirms its malicious nature. The attack pattern involves exploiting a known vulnerability in PDF viewers to achieve arbitrary code execution.

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)
U3D/3D content in PDF — Adobe Reader 3D parser CVE-family indicator high CVE related PDF_U3D_CVE_RELATED

PDF contains U3D (Universal 3D) or 3D annotation content — CVE-2011-2462 and CVE-2009-3953 are critical vulnerabilities in Adobe Reader's U3D processing that allow arbitrary code execution. U3D content in PDFs is extremely rare in normal documents.
Annotation subject percent-decoding eval stager critical PDF_ANNOT_SUBJECT_MARKER_EVAL_STAGER

OpenAction JavaScript forces annotation enumeration, reads an annotation /Subject payload with getAnnots(), rewrites marker bytes into percent escapes, decodes it with unescape(), and dispatches it through eval. This is a high-confidence exploit-kit staging pattern. It is intentionally not mapped to CVE-2009-1492 unless getAnnots() itself carries the crafted integer or long argument shape for that vulnerability.
ClamAV: Pdf.Exploit.Agent-36064 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Exploit.Agent-36064
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.
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 4

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj0007_000.js` `a5c8f0f722df4dd9876a0087e1eee65bd3020c5995f94f6729f7e17f3f3677a0`	pdf-javascript-stream	PDF /JS object 7 at offset 0x1A4	331 bytes
`legacy_pdfkit_stage_000.js` `108d230da78da2d00b3d821584b989ab3e73b006e4e723473037657b09e00617`	deobfuscated-js	repeated-marker hex decoded JavaScript at offset 0x2F9	12885 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 long base64-like blob(s).
`legacy_pdfkit_stage_001.js` `c044157203e1b5b8c7c7a640c97d05d34c6c89c9f501fabd6c9c5ac9318d461f`	deobfuscated-js	repeated-marker hex decoded JavaScript at offset 0x2F9	5474 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 5 eval/decoder/string-building token(s).
`u3d_00_off00003743.bin` `db166b7bf539ceb527a321927dc7262838bbe91b146a4aa26884d46ee5696f20`	pdf-3d-stream	PDF U3D 3D stream at offset 0x3743	27443 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact entropy is 7.99, consistent with packed or encrypted content.

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