PDF malware analysis — malicious · 3f70d0145590b33e

MALICIOUS

PDF

44.2 KB

MD5: 808436bac6652becdf2442809cc7855c SHA-1: 035bf02d682757204878979fa0740992d4b6e3be SHA-256: 3f70d0145590b33edc936dc130cd837fb6ba5aaabafeb1b9c1a81d86a382e34c

106 Risk Score

Malware Insights

MITRE ATT&CK

T1204.002 Malicious File: Malicious File

The PDF file contains embedded JavaScript and U3D content, triggering heuristics related to JavaScript execution and a known Adobe Reader 3D parser vulnerability (CVE-family). The presence of multiple JavaScript streams, including a large deobfuscated one, suggests the script is designed to download and execute a second-stage payload. The unescape() function call further indicates obfuscation techniques common in exploit delivery.

Heuristics 6

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.
unescape() call high PDF_UNESCAPE

unescape() found — often used to decode shellcode in PDF JS exploits (matched inside decoded stream)
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_obj0009_000.js` `a071b43d5f5358ba43101f43a755162fbda66fc01f03fe7461cf777fdd16a7ae`	pdf-javascript-stream	PDF /JS object 9 at offset 0x4235	469 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` `8987591f4268db980eaf132550044d6600f09ff40f001e9aadabd7c2b4211dcc`	deobfuscated-js	repeated-marker hex decoded JavaScript at offset 0x1AC8	11819 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` `4b991aa6a46aab42757918bc396e0d338830d138eef094a4605d8b3ca66dbcba`	deobfuscated-js	PDF JavaScript deobfuscation pass	229537 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s). Carved artifact contains 2 long base64-like blob(s).
`u3d_00_off0000446a.bin` `fb27c6f6ffe2b08a88f79f344ef3cb4f85460ac81a062194b6fd84ab6e48b628`	pdf-3d-stream	PDF U3D 3D stream at offset 0x446A	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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