PDF malware analysis — malicious · 3b13c2f804512a84

MALICIOUS

PDF

43.8 KB

MD5: 3f1f4d5824ea9a3a9f008b95d9865cf8 SHA-1: 4b9b3034d02b859609b49913eaa5bf48cfc2aaa2 SHA-256: 3b13c2f804512a845ae084037696ab5904f327b3a7d10edf0357b222a753a493

164 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.002 Malicious File

The PDF file contains embedded JavaScript, indicated by multiple heuristic firings including 'PDF_JAVASCRIPT', 'PDF_JS', and 'PDF_EVAL'. The presence of 'PDF_U3D_CVE_RELATED' suggests exploitation of a vulnerability within Adobe Reader's 3D content parsing. The 'PDF_UNESCAPE' and 'EXTRACTED_FILE_STATIC_TRIAGE' heuristics point to obfuscated JavaScript, likely designed to download and execute a second-stage payload. The extracted JavaScript files, particularly 'deobfuscated.js', are strong indicators of malicious intent.

Heuristics 7

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.
eval() call high PDF_EVAL

eval() found — commonly used for obfuscated exploit execution (matched inside decoded stream)
unescape() call high PDF_UNESCAPE

unescape() found — often used to decode shellcode in PDF JS exploits (matched inside decoded stream)
Suspicious extracted artifact medium 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.
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)

Extracted artifacts 4

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj0007_000.js` `93f3fdceb942579280d3f196f445d15453064a5ad968d92ae645d590c8b83fa8`	pdf-javascript-stream	PDF /JS object 7 at offset 0x19C	166 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s).
`legacy_pdfkit_stage_000.js` `17c0bb86d4e4d7e31b273665ee6b71cd5f08359889e142046f1c75060b5467ba`	deobfuscated-js	repeated-marker hex decoded JavaScript at offset 0x29F	23564 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s). Carved artifact contains 1 long base64-like blob(s).
`deobfuscated.js` `a88b1f5468550abd7502a608e0744a15566efd24ac0482e4c5a0ab00ab705a82`	deobfuscated-js	PDF JavaScript deobfuscation pass	239041 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 4 eval/decoder/string-building token(s). Carved artifact contains 1 long hex-escaped blob(s).
`u3d_00_off00004302.bin` `70cf2aead4823e6d2651c9281eed0aa967449da358f439efb9e8e707421175e0`	pdf-3d-stream	PDF U3D 3D stream at offset 0x4302	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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