PDF malware analysis — malicious · e78c6abf516b3c6b

MALICIOUS

PDF

3.7 KB

MD5: 8093e298b806feff512857ef07d40140 SHA-1: 1356df5c6cf32675b04bf1d3f1d20c027089136b SHA-256: e78c6abf516b3c6b2c51bb72f666324515398d2322bbca08e7025ba099763c7e

192 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.002 Malicious File

The PDF contains multiple embedded JavaScript streams and uses the unescape() function, indicating an attempt to obfuscate malicious code. The ML classifier also flagged this PDF as malicious. The embedded scripts are likely responsible for downloading and executing a second-stage payload, a common technique for initial access.

Machine Learning

Nyx PDF Classifier malicious score 0.7015

Heuristics 9

Embedded PDF child has suspicious static findings critical PDF_EMBEDDED_CHILD_STATIC_TRIAGE

PDF contains an embedded PDF stream whose extracted child matches suspicious or malicious PDF heuristics. Wrapper PDFs are commonly used to hide the actual exploit or lure payload from scanners that do not recursively inspect attachments.
unescape() call high PDF_UNESCAPE

unescape() found — often used to decode shellcode in PDF JS exploits (matched inside decoded stream)
Embedded script payload in PDF stream medium PDF_EMBEDDED_SCRIPT_PAYLOAD

PDF stream bytes contain an HTML/XFA <script> tag without accompanying Windows shell-execution primitives — common in accessible XFA forms but worth surfacing for analyst review.
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.
XFA form low PDF_XFA

PDF uses XML Forms Architecture — can contain script logic
AcroForm button with action trigger low PDF_ACROFORM_BUTTON

PDF contains a /Btn form field together with a SubmitForm/URI/Launch/JS trigger — this is the building block of fake 'Download' or 'Open' button overlays used in PDF phishing lures
Embedded file low PDF_EMBEDDED

PDF embeds a file attachment — could carry an executable or another weaponised document as a nested payload (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 6

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj0001_000.js` `a5dee5e3f4dbfab6f2c32585d1e3034d762e5033d4804a2c0589ca678c1c4dc5`	pdf-javascript-stream	PDF /JS object 1 at offset 0xA	2415 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 6 eval/decoder/string-building token(s).
`stream_004_off00001670.js` `931031fed47ee678318314713b542e594ca42a7667601a65de32db49ad63088d`	decompressed-pdf-stream	PDF FlateDecoded stream at offset 0x1670	987 bytes
`font_00_type1_off00000ebd.bin` `e088377bf6b0843856b7591bfd0eb52b38a3f59cc376e8b76ef6852dcd5d9eca`	pdf-font-stream	PDF embedded font (type1) at offset 0xEBD	83 bytes
`font_01_type1_off000011c8.bin` `0979c864c1250cca928db238103d0457396ce28e4219e82537b7efb6c01a1a5d`	pdf-font-stream	PDF embedded font (type1) at offset 0x11C8	132 bytes
`stream_001_off000001f8.js` `ef55eae7e4aeb7594a1425f8540c0516e13074e840dca2201e0648a97c5b039a`	decompressed-pdf-stream	PDF FlateDecoded stream at offset 0x1F8	6566 bytes
`objstm_0002_00.bin` `c146b8f279b5b067d378affa02f4b747000e653db53639d69f0b179239ebfc8c`	pdf-objstm-decoded	PDF /ObjStm 2 0 obj (inflated)	593 bytes

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