PDF / .BAK malware analysis — malicious · 2f1b18839916b61f

MALICIOUS

PDF / .BAK

43.4 KB

MD5: bbb337594c9c7edb3312eee5f66059d9 SHA-1: 91ef5a220ef8705b9ee36925a1a7e907f914206e SHA-256: 2f1b18839916b61febd64a12cec7f144cfcca99647a2fe23b4c6d409a1726b57

66 Risk Score

Malware Insights

MITRE ATT&CK

T1204.002 Malicious File T1059.001 PowerShell T1059.003 Windows Command and Shell

The PDF file contains embedded JavaScript and U3D content, triggering heuristics related to known Adobe Reader vulnerabilities. The presence of deobfuscated JavaScript files suggests the execution of malicious code. The primary attack vector appears to be exploiting a PDF vulnerability to run arbitrary code, likely to download and execute further payloads.

Heuristics 5

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.
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.
syncAnnotScan annotation-staging primitive low PDF_FOXIT_SYNCANNOTSCAN

PDF JavaScript calls syncAnnotScan() — a no-op annotation-enumeration primitive used by exploit-kit JavaScript to stage payload reads from annotation /Subject fields before eval(). Not a vulnerable sink itself; rarely seen in legitimate PDFs. (matched in decompressed 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 4

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj0005_000.js` `e98d2ee473b9a16751401b2efe1ab53561db61f4b1f06b39437a60319734e8ab`	pdf-javascript-stream	PDF /JS object 5 at offset 0x14F	479 bytes
`legacy_pdfkit_stage_000.js` `d7040ab1a018ac0b57533b5eb6b24bddd1b9cc860a448dc1203b47f4e798020f`	deobfuscated-js	repeated-marker hex decoded JavaScript at offset 0x1BB6	13154 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s). Carved artifact contains 1 long base64-like blob(s).
`deobfuscated.js` `c30a0eefb9d484d86acc0504a1fedd3effea05f86e9f0ea53d62f85f692e9eae`	deobfuscated-js	PDF JavaScript deobfuscation pass	295450 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 long base64-like blob(s).
`u3d_00_off00004152.bin` `fb27c6f6ffe2b08a88f79f344ef3cb4f85460ac81a062194b6fd84ab6e48b628`	pdf-3d-stream	PDF U3D 3D stream at offset 0x4152	28021 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact entropy is 7.79, consistent with packed or encrypted content.

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